The geochemical characteristics of Jurassic source rock and oil-gas exploration direction in Chaoshui Basin,China

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  • 1.Central Laboratory of Geoscience,Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;2.Key Laboratory of Petroleum Geochemistry,PetroChina,Beijing 100083,China;3.China University of Mining and Technology,Beijing 100083,China;4.Research Institute of Petroleum Exploration and Development,Yumen Oilfield Company,PetroChina,Jiuquan 735019,China

Received date: 2015-12-14

  Revised date: 2016-02-22

  Online published: 2019-09-19

Abstract

The high-quality lacustrine muddy source rocks(TOC>1.0%,S1+S2>6.0mg/g)are discovered and confirmed through a variety of organic geochemical analyses on dense core and debris samples from different parts of Chaoshui Basin,which is in scale in Jurassic Xinhe Formation and in some segments of Qingtujing Formation.The high-quality muddy source rocks,developed in semi-deep lake and deep lake facies,contain high organic matter abundance,good organic matter type(mainly for Ⅱ1 to type Ⅰ)and high sapropelinite content.The medium coal measure source rocks with poor type of organic matter are developed in Qingtujing Formation and Jijigou Formation.The mudstone source rocks of Xinhe Formation are the main source rocks and those of Qingtujing Formation are secondary source rocks in Chaoshui Basin.The significant difference in the organic maturity of source rocks shows that “lower in the north basin and higher in the south basin,lower in upper part and higher in lower part in each section”.There is positive correlation between the maturity of source rock and the present burial depth.The source rocks of Xinhe Formation in the north of the basin is in immature to low mature stage and those in the south is in low-mature to mature stage.The source rocks of Qingtujing Formation in the north is in low mature stage and those in the south is in mature stage.The oil-generating conditions in the Jinchang Depression in the south of the basin are better than those of Hongliuyuan Depression and Ayouqi Depression in the north of the basin.The next prospecting targets for petroleum exploration are the structural high part in the vicinity of Jinchang Depression and the low uplift structure and lithologic traps developed within Jinchang Depression in the south of the basin.The favorable area for finding tight oil reservoirs is the region of low uplift location and within hydrocarbon source rocks in Hongliuyuan Depression and Ayouqi Depression in the north of the basin,where Jurassic lacustrine high-quality source rock is in deeper buried area.

Cite this article

Tu Jian-qi, Li Cheng-jian, Nan Hong-li, Zhang Bin, Liu Yan, Fei Xuan-dong, Zhou Wen-bao, Yuan Yi-lin . The geochemical characteristics of Jurassic source rock and oil-gas exploration direction in Chaoshui Basin,China[J]. Natural Gas Geoscience, 2016 , 27(7) : 1277 -1289 . DOI: 10.11764/j.issn.1672-1926.2016.07.1277

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