Distribution and Evaluation of Oligocene Source Rocks in the East of&nbsp; Central Depression Belt in Deep-water Area,Qiongdongnan Basin

WANG Zi-song，LIU Zhen，HUANG Bao-jia，SUN Zhi-peng，YAO Zhe，CHEN Yu-hang，LIU Peng，WANG Bing

doi:10.11764/j.issn.1672-1926.2014.03.360

2014 , Vol. 25 >Issue 3: 360 - 371

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.03.360

Distribution and Evaluation of Oligocene Source Rocks in the East of Central Depression Belt in Deep-water Area,Qiongdongnan Basin

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1.College of Geosciences,China University of Petroleum,Beijing 102249,China;
2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,
Beijing 102249,China;3.Zhanjiang Branch of CNOOC Ltd.,Zhanjiang 524057,China

Received date: 2013-05-29

Revised date: 2013-08-06

Online published: 2014-03-10

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Abstract

Based on the prediction and determination of the distribution characteristics of thickness,maturity and organic facies of Oligocene source rocks in the east of Central Depression Belt,according to the calculation of the volume,gas generation quantity and intensity of source rocks,source rocks were comprehensively evaluated and the gas-rich sags were optimized.The results show:(1)Generally,Lingshui source rocks are thicker than those of Yacheng,and the percentages of mud in Ya-2 member and Ling-2 member are the most of all.The mud deposition centers evolved from west to east and from sporadic distribution in Yacheng Formation to regional distribution in Lingshui Formation;(2)The thermal evolution of source rocks was early in the west and late in the east, and the modern maturities of different formations are high in the west and low in the east;(3)The quality of Oligocene source rocks is better in general,in which the coal layer is excellent in gas generation capacity,and the gas generation capacity of mud is from moderate to good.The main organic facies in Yacheng Formation are shallow sea and shore,but the main organic facies in Lingshui Formation are inner and outer shallow sea;(4)Baodao Sag,Changchang Sag and Songnan Sag are all gas-rich sags.However,Baodao Sag is the best,follows by the Changchang Sag,and then by the Songnan Sag.

Key words： General evaluation; Distribution characteristics; Source rocks; Oligocene; The Central Depression Belt; Deep-water area; Qiongdongnan Basin

Cite this article

WANG Zi-song，LIU Zhen，HUANG Bao-jia，SUN Zhi-peng，YAO Zhe，CHEN Yu-hang，LIU Peng，WANG Bing . Distribution and Evaluation of Oligocene Source Rocks in the East of Central Depression Belt in Deep-water Area,Qiongdongnan Basin[J]. Natural Gas Geoscience, 2014 , 25(3) : 360 -371 . DOI: 10.11764/j.issn.1672-1926.2014.03.360

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