Contribution of Marine Source Rock to Hydrocarbon Accumulation,Zhu ⅡSag

GUO Yu-feng, DU Xiu-qin, FU Ning

doi:10.11764/j.issn.1672-1926.2014.12.1975

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 12: 1975 - 1982

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.12.1975

Contribution of Marine Source Rock to Hydrocarbon Accumulation,Zhu ⅡSag

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1.Exploration and Development Research Institute of PetroChina Changqing Oilfield Company，Xi′an 710018,China;
2.China Research Institute,China National Offshore Oil Corporation,Beijing 100027,China

Received date: 2014-02-14

Revised date: 2014-03-25

Online published: 2019-09-18

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Abstract

Marine source rocks within Zhu ⅡSag were defined as the source rocks deposited under the marine-terrestrial transitional facies (Enping Formation and Zhuhai Formation).This kind of source rock,with average TOC of 1.2% and Ⅱ₂ type kerogen,contains mixed organic matters of terrestrial and marine origin,so it has the ability to yield oil and gas.Comprehensive oil-source correlation indicated that light (condensate) oils can be classified to three types:coal-derived oil,marine-soured oil and mixed oil.Mixture contribution of two end members of coal and marine source rock was calculated with mathematic method.It shows that the oil from PY34-1-2,PY30-1-3,PY34-1-1 gas fields in the north slope of Baiyun Sag are predominate from coal measure with its contribution more than 70%|while the oil from LH19-5-1,LH19-5-2D,PY30-1-2,PY35-2-1 and PY35-2-5 gas fields are originated mainly from marine source rocks with its contribution up to 60%-87%|and the oil,from LW3-1-2,LW3-1-4,LH34-2-1,LH29-1-1 and LH16-2-1 wells in deep water zone,Baiyun Sag(Liwan area),are mixture origin but with about 60% from marine source rock.The result indicates that coal measure source rocks are restricted within northern slope area,while marine source rocks distributed in deep water zone of Baiyun Sag are the main contributor within this area.

Key words： Marine source rocks; Oil origin type; Oil source correlation; Mixture proportion calculation; Baiyun Sag; Pearl River Mouth Basin

Cite this article

GUO Yu-feng, DU Xiu-qin, FU Ning . Contribution of Marine Source Rock to Hydrocarbon Accumulation,Zhu ⅡSag[J]. Natural Gas Geoscience, 2014 , 25(12) : 1975 -1982 . DOI: 10.11764/j.issn.1672-1926.2014.12.1975

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