GulfSlope Energy, Inc. 8-K

Exhibit 99.1

OTCQB: GSPE Leading the Gulf of Mexico Recovery 2018 Louisiana Energy Conference May 30, 2018

2 This presentation may contain forward - looking statements about the business, financial condition and prospects of the Company. Forwar d - looking statements can be identified by the use of forward - looking terminology such as “believes,” “projects,” “expects,” “may,” “goal,” “estimates,” “should,” “plans,” “targets,” “intends,” “could,” or “anticipates,” or the negative thereof, or other variations th ereon, or comparable terminology, or by discussions of strategy or objectives. Forward - looking statements relate to anticipated or expecte d events, activities, and trends. Because forward - looking statements relate to matters that have not yet occurred, these statements are inherently subject to risks and uncertainties. Forward - looking statements in this presentation include, without limitation, the Company’s e xpectations of oil and oil equivalents, barrels of oil and gas resources, prospects leased , dollar amounts of value creation, undiscovered resources, drilling success rates, resource information, superior economics, consistent value growth and other performance results. The SEC permits oil and gas companies, in their filings with the SEC to disclose only proved, probable and possible reserves, i.e . Items 1201 through 1208 of Regulation S - K (“SEC Oil and Gas Industry Disclosures” ). The estimates of recoverable resources used in this presentation do not comply with the SEC Oil and Gas Industry Disclosures, nor should it be assumed that any recoverable resources will be classified as proved, probable or p oss ible reserves consistent with the SEC Oil and Gas Industry Disclosures. Recoverable resources estimates are undiscovered, highly speculativ e r esources estimated where geological and geophysical data suggest the potential for discovery of petroleum but where the level of proof is insufficient for a classification as reserves or contingent resources. In addition, recoverable resources have a great amount of uncertainty as to their existence, absolute amount, and economic feasibility . Although the Company believes that the expectations reflected in forward - looking statements are reasonable, there can be no assurances that such expectations will prove to be accurate. Potential and existing shareholders are cautioned that such forward - looking statements involve risks and uncertainties. The forward - looking statements contained in this presentation speak only as of the date of this presentation, and the Company expressly disclaims any obligation or undertakin g t o report any updates or revisions to any such statement to reflect any change in the Company’s expectations or any change in events, condi tio ns or circumstances on which any such statement is based. Certain factors may cause results to differ materially from those anticip ate d by some of the statements made in this presentation. Please carefully review our filings with the SEC as we have identified many risk fa cto rs that impact our business plan. U.S. investors are urged to consider closely the disclosures in our Forms 10 - K, 10 - Q, 8 - K and other filings with the SEC, which can be electronically accessed from our website at www.GulfSlope.com or the SEC's website at http://www.sec.gov / . Abbreviations : MM Million $ United States dollar B B illion RTM Reverse time migration BOE Barrel of oil equivalent GSPE GulfSlope Energy, Inc . EUR Estimated ultimate recovery SEC Securities and Exchange Commission Mcf Million cubic feet DHI Direct hydrocarbon i ndicator NPV 10 Net Present Value discounted at 10 % IRR Internal rate of return F&D Costs Full cycle finding and development c osts Pg Likelihood of encountering recoverable hydrocarbons Forward Looking Statement

3 World Class Opportunity • Delek Group, Ltd. secured as partner for drilling portfolio • Anticipate a minimum of two wells to be drilled in 2018 • High specification jackup rig contracted for initial drilling 2018 Drilling Program Underway • Nine well portfolio ready - to - drill with over 1 billion BOE of gross unrisked recoverable resources • Represents approximately $11+ billion of net present value Significant Oil and Natural Gas Exposure • GulfSlope executive team credited for originally discovering this play • Industry has developed 1.8+ billion BOE from multiple discoveries • Strategic advantage from proprietary RTM reprocessed seismic Proven Play • Prospects offer 65%+ IRRs in current pricing environment • Gulf of Mexico has among the lowest breakeven costs in the industry • Significant existing infrastructure with multiple points of sale Superior Economics • Executive leadership with GoM exploration and operations experience • Proven track record of applying best technologies to find oil and gas • Specialized technical team with extensive local knowledge in GoM Experienced Team Resource figures are based on Company estimates and reflect gross unrisked recoverable resources for 100% working interest . NPV10 and IRR assume NYMEX strip pricing as of May 21, 2018, and reflect unrisked recoverable resources for 100% working interest, net of royalties and net profits interest.

4 Focused on Proven Subsalt Miocene Play Mahogany >60+ MMBoe Discovered 1 St Prod 1993 1997 Hickory >75+ MMBoe Discovered 1 St Prod 1998 2000 Conger >250+ MMBoe Discovered 1 St Prod 1998 2000 Conger Enchilada Tanzanite Tarantula Hickory Mahogany Monazite Teak Agate Conger Field 250+ MMBOE Cardamom Field 140+ MMBOE Enchilada Field 35 MMBOE Mahogany Field 60+ MMBOE Hickory Field 75+ MMBOE Tanzanite Field 2 0 MMBOE Corvette Tanker Graviton Photon Pomeron Tachyon Tau Katmai Discovery Quark Canoe Tornado Discovery Megalodon Discovery EW 910 Field Deep Discovery Recent Activity Legacy Discoveries Louisiana TX 400+ MMBOE discovered below salt in the GulfSlope Area of Interest

5 Proven Reservoirs Comparable to Deep Water Thick slope and basin floor sands were distributed across the shelf and deepwater – proven by multiple wells

6 World Class Partner Summary of Farmout Terms • Minimum commitment by Delek to drill two exploratory wells in Phase 1 ‒ Partnership has selected Canoe Shallow and Tau prospects to be drilled ‒ Delek has the option to participate in multiple additional two - well phases • Delek paying 90% of exploration costs to earn 75% working interest ‒ GulfSlope to retain 20% working interest and will receive $1.1 million cash per prospect drilled ‒ GulfSlope will be operator and will fund 8% of exploratory costs ‒ Delek has option to become operator upon commercial discovery • Delek will have the right to purchase up to 5% of GulfSlope’s common stock after each phase, up to a total of 20% of GulfSlope’s common stock after four phases • GulfSlope and Delek are pursuing additional GOM opportunities Delek Group, Ltd . • Leading international independent exploration and production company ‒ Publicly traded on Tel Aviv Exchange (Symbol: DLEKG) ‒ Delek’s market capitalization is approximately $1.9 billion (1 ) • Offshore - focus with particular emphasis on applying latest technology to exploration • Leveraging success in Eastern Mediterranean Sea (Leviathan and Tamar Fields) and North Sea to become global operator GulfSlope has partnered with Delek Group Ltd. for the drilling of its prospect portfolio (1) In USD as of May 22, 2018.

7 0 5 10 15 20 25 30 35 Canoe (2) Canoe Tau Months Drilling Development Regulatory/POD Production • 18MMBOE prospect with $178MM NPV 10 » 3.6MMBOE with $33MM NPV 10 net to GulfSlope • $4.6MM dry hole cost – 5,500ft drilling depth » $370k dry hole cost net to GulfSlope • Direct hydrocarbon indicators present • Immediately offset by analogue production • Can be drilled with standard jack - up rig • Target spud date mid - 2018 • Status : Awaiting Final Regulatory Approval • 300+ MMBOE prospect with $3.6+B NPV 10 » 51MMBOE with $672MM NPV 10 net to GulfSlope • $ 38.7MM dry hole cost – 26,000ft drilling depth » $3.1MM dry hole cost net to GulfSlope • Analogue – prolific Mahogany and Conger fields • High spec jack - up required for drilling • 1st production in less than 36 months • Anticipate drilling immediately after Canoe • Status : Awaiting Final Regulatory Approval C ANOE T AU Phase I Drilling Program on Schedule Estimated Timeline (1) Regulatory/POE Exploratory (1) Assumes rig availability. (2) Reflects alternative development scenario which could decrease time to first production . Appraisal GulfSlope anticipates drilling a minimum of two wells in 2018

8 Prospects Canoe Shallow Corvette Graviton Photon Pomeron Quark Tachyon Tanker Tau Total / W. Avg. EUR (MMBOE) 18 70 190 88 32 156 112 89 301 1,050 Drill Depth 5,500’ 22,500’ 25,000’ 19,000’ 15,000’ 23,000 19,000’ 25,000’ 26,000’ Water Depth 320’ 300’ 325’ 405’ 325’ 430’ 415’ 325’ 280’ Percentage Oil 73% 77% 27% 59% 19% 59% 59% 75% 75% 59% Exploration Well DHC ($MM) $5 $25 $ 36 $24 $19 $26 $25 $36 $ 39 $235 Prospect DHI 3 - /4 - way 3 - / 4 - way DHI DHI Submarine Fan DHI 3 - way 3 - way Risk (Pg) 80% 43% 39% 81% 62% 44% 72% 52% 44% 51% F&D Costs ($/BOE) $5.28 $3.27 $3.06 $4.08 $5.00 $2.21 $3.61 $3.96 $3.35 $3.31 NPV10 ($MM) $178 $698 $1,066 $1,099 $150 $2,078 $1,401 $1,119 $3,648 $11,437 IRR 92% 73% 40% 72% 31% 101% 74% 65% 62% 66% High Impact Drilling Portfolio Note: Resource figures are based on Company estimates and reflect gross unrisked recoverable resources for 100% working interest . DHC based on current rates for jackup drilling rigs. NPV10 and IRR assume NYMEX strip pricing as of May 21, 2018 (Assumes average annual oil price per barrel for 2018 - 2021 of $69, $66, $61, $58, respectively, and held flat there after. Assumes average annual gas price per mcf for 2018 - 2020 of $2.92, $2.76, and $2.82, respectively, and held flat thereafter). Reflect unrisked recoverable resources for 100% working in ter est, net of royalties and net profits interest. GulfSlope has advanced nine high potential prospects to drill - ready status that could hold more than 1 billion BOE of gross recoverable resources representing approximately $11.4 billion of net present value

9 Value Proposition $178 $3,826 $4,524 $5,590 $6,689 $6,839 $8,917 $10,318 $11,437 $0 $2,000 $4,000 $6,000 $8,000 $10,000 $12,000 $14,000 Canoe Shallow Tau Corvette Graviton Photon Pomeron Quark Tachyon Tanker $ Millions Prospect Net Present Value @ 10% Cumulative NPV @ 10% NPV @ 10% Phase 1 Resource figures are based on Company estimates and reflect gross unrisked recoverable resources for 100% working interest . NPV10 assumes NYMEX strip pricing as of May 21, 2018, and reflect unrisked recoverable resources for 100% working interest, net of royalties and net profits interest. Potential for approximately $11.4 billion in net present value for ready to drill prospects

OTCQB: GSPE GulfSlope Energy John H. Malanga 281.918.4103 john.malanga@gulfslope.com www.GulfSlope.com

11 GulfSlope’s “Goldilock’s Zone” Play Area SaltSalt Salt LowerTertiary UpperMiocene Salt Salt Salt Plio-Pleistocene SupraSalt 30,000' 20,000' 10,000' 0 Shelf Deepwater North South LowerTertiary Target Zone 5000' 15,000' 25,000' Lower Miocene LowerMiocene LowerMiocene UpperMiocene Upper Miocene Lafitte Mahogany Hickory Tahiti Jack SaltSalt Salt LowerTertiary UpperMiocene Salt Salt Salt Plio-Pleistocene SupraSalt 30,000' 20,000' 10,000' 0 Shelf Deepwater North South LowerTertiary Target Zone 5000' 15,000' 25,000' Lower Miocene LowerMiocene LowerMiocene UpperMiocene Upper Miocene Lafitte Mahogany Hickory Tahiti Jack SaltSalt Salt LowerTertiary UpperMiocene Salt Salt Salt Plio-Pleistocene SupraSalt 30,000' 20,000' 10,000' 0 Shelf Deepwater North South LowerTertiary Target Zone 5000' 15,000' 25,000' Lower Miocene LowerMiocene LowerMiocene UpperMiocene Upper Miocene Lafitte Mahogany Hickory Tahiti Jack SaltSalt Salt LowerTertiary UpperMiocene Salt Salt Salt Plio-Pleistocene SupraSalt 30,000' 20,000' 10,000' 0 Shelf Deepwater North South LowerTertiary Target Zone 5000' 15,000' 25,000' Lower Miocene LowerMiocene LowerMiocene UpperMiocene Upper Miocene Lafitte Mahogany Hickory Tahiti Jack SaltSalt Salt LowerTertiary UpperMiocene Salt Salt Salt Plio-Pleistocene SupraSalt 30,000' 20,000' 10,000' 0 Shelf Deepwater North South LowerTertiary Target Zone 5000' 15,000' 25,000' Lower Miocene LowerMiocene LowerMiocene UpperMiocene Upper Miocene Lafitte Mahogany Hickory Tahiti Jack SaltSalt Salt LowerTertiary UpperMiocene Salt Salt Salt Plio-Pleistocene SupraSalt 30,000' 20,000' 10,000' 0 Shelf Deepwater North South LowerTertiary Target Zone 5000' 15,000' 25,000' Lower Miocene LowerMiocene LowerMiocene UpperMiocene Upper Miocene Lafitte Mahogany Hickory Tahiti Jack Ultra - Deep Gas Subsalt Deepwater Miocene & L. Tertiary 5,000’ 10,000’ 15,000’ 20,000’ 25,000’ 30,000’ 35,000’ Plio - Pleistocene Supra - Salt Salt Salt Upper Miocene Lower Tertiary Deepwater Shelf Proven & Potential Section Lafitte Hickory Mahogany Conger Tahiti Jack Subsalt Shelf Miocene Lower Miocene North South GulfSlope is focused on a proven area at the shelf/slope break where commercial fields have been producing for years

12 Delta Sands Feed Slope Basin Fans & Channels Major Delta Sands Basin Floor Sands Intraslope Basin Fan & Channel Sands Intraslope Basin Fan & Channel Sands GulfSlope