格斯断槽侏罗系暴露烃源岩地球化学综合研究

COMPREHENSIVE STUDY ON THE GEOCHEMISTRY OF THE JURASSIC EXPOSED SOURCE ROCKS IN THE GESI FAULT TROUGH

甘贵元 尹成明 张鹏 朱叶倩 陈登钱 崔俊

Gan Guiyuan Yin Chengming Zhang Peng Zhu Yeqian Chen Dengqian Cui Jun

青海油田公司勘探开发研究院, 甘肃, 敦煌 736202

Research Institute of Petroleum Exploration and Development, Qinghai Oilfield Corporation, Dunhuang, Gansu 736202, China

近3年来,格斯断槽多次的石油地质调查和综合研究取得了重要成果.在第三系砂岩和侏罗系碳酸盐岩中均发现了油砂,地面出露有巨厚的侏罗系和第三系地层,烃源岩主要是分布在侏罗系中、下统(J1+2)地层中的黑色泥质岩和碳酸盐岩.泥质烃源岩占侏罗系中、下统地层厚度的32.8%～46.1%,碳酸盐岩主要发育在黑水沟地区,占侏罗系中、下统的30.5%.地面露头样品分析结果的综合研究显示,其泥质烃源岩是有机质类型好、丰度高、高成熟度的好烃源岩,碳酸盐岩烃源岩是有机质类型更好、高丰度、高成熟度的最好烃源岩.广泛分布的泥质烃源岩是格斯断槽最主要的油气源岩,主要分布于东部的碳酸盐岩烃源岩也是重要的油气源岩.

In recent three years,important achievements have been obtained from many times of petroleum geological investigation and comprehensive research.Oil sand is discovered in the Tertiary sandstones and the Jurassic carbonate rocks.The Jurassic and Tertiary megathick strata is outcropping from ground.Hydrocarbon source rocks are mainly black argillaceous rocks and carbonate rocks distributed in the Middle-Lower Jurassic (J1+2) strata.Argillaceous source rocks make up 32.8-46.1 per cent of the Middle-Lower Jurassic stratum thickness,while cardonate source rocks,which are mainly developed in Heishuigou region,amount to 30.5 per cent.Comprehensive study on the analytical results of outcropped surface samples show that argillaceous source rocks are good hydrocarbon source rocks with the good types,high abundance and high maturity of organic matter,and carbonate source rocks are the best with the well types,high abundance and high maturity of organic matter.Widespread argillaceous source rocks are the most major hydrocarbon source rocks in the Gesi Fault Trough,and carbonate source rocks mainly distributed in the east are important hydrocarbon source rocks.

https://doi.org/10.11781/sysydz200101093