Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

EnCap Energy Capital Fund VIII, L.P.

2. Date of Event Requiring Statement (MM/DD/YYYY) 2/14/2018

3. Issuer Name and Ticker or Trading Symbol

Oasis Petroleum Inc. [OAS]

(Last) (First) (Middle)

1100 LOUISIANA STREET, SUITE 4900

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director ___ X ___ 10% Owner
_____ Officer (give title below) _____ Other (specify below)

(Street)

HOUSTON, TX 77002

(City) (State) (Zip)

5. If Amendment, Date Original Filed (MM/DD/YYYY)

6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, par value $0.01 per share	46000000 ⁽¹⁾ ⁽²⁾	I	See footnote ⁽³⁾ ⁽⁴⁾

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:
(1)	On February 14, 2018, Forge Energy, LLC, a Delaware limited liability company ("Forge"), and the Issuer consummated the transactions contemplated by that certain Purchase and Sale Agreement by and among Forge, as Seller, and Oasis Petroleum Permian LLC, as Purchaser ("Oasis Permian"), and the Issuer dated December 11, 2017, pursuant to which Forge sold 20.3 thousand net acres in the Permian Basin to Oasis Permian, in exchange for approximately $463 million in cash and 46 million shares of common stock, par value $0.01 per share, of the Issuer valued at approximately $463 million as of the close of trading on December 8, 2017.
(2)	Each reporting person disclaims beneficial ownership of the reported securities except to the extent of such reporting person's pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of the reported securities for purposes of Section 16 or for any other purpose.
(3)	These securities are held directly by Forge, a wholly-owed subsidiary of Forge Energy Holdings, LLC ("Forge Holdings"). EnCap Energy Capital Fund VIII, L.P. ("EnCap Fund VIII") is a member of Forge Holdings that holds the right to appoint four of the seven representatives to the board of managers of Forge Holdings. Each of the managers of Forge Holdings has one vote and decisions are made by a majority vote. As a result, EnCap Fund VIII may be deemed to have the power to vote or direct the vote or to dispose or direct the disposition of the shares owned by Forge. EnCap Partners GP, LLC ("EnCap Partners GP") is the sole general partner of EnCap Partners, LP ("EnCap Partners"), which is the managing member of EnCap Investments Holdings, LLC ("EnCap Holdings"), which is the sole member of EnCap Investments Holdings Blocker, LLC ("EnCap Holdings Blocker").
(4)	(Continued from Footnote 3) EnCap Holdings Blocker is the sole member of EnCap Investments GP, L.L.C. ("EnCap Investments GP"), which is the sole general partner of EnCap Investments L.P. ("EnCap Investments LP"). EnCap Investments LP is the general partner of EnCap Equity Fund VIII GP, L.P. ("EnCap Fund VIII GP"), the sole general partner of EnCap Fund VIII. Therefore, EnCap Partners GP, EnCap Partners, EnCap Holdings, EnCap Holdings Blocker, EnCap Investments GP, EnCap Investments LP and EnCap Fund VIII GP may be deemed to beneficially own these securities.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
EnCap Energy Capital Fund VIII, L.P. 1100 LOUISIANA STREET, SUITE 4900 HOUSTON, TX 77002		X
EnCap Partners GP, LLC 1100 LOUISIANA STREET, SUITE 4900 HOUSTON, TX 77002		X
Forge Energy, LLC 15727 ANTHEM PARKWAY, SUITE 501 SAN ANTONIO, TX 78249		X

Signatures
EnCap Energy Capital Fund VIII, L.P., By: EnCap Equity Fund VIII GP, L.P., its general partner, EnCap Investments L.P., its general partner, EnCap Investments GP, L.L.C, its general partner, /s/ D. Martin Phillips, Managing Partner		2/20/2018
^** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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