酒泉盆地营尔凹陷有效烃源岩的确认及其展布特征

Confirmation and distribution features of effective source rocks in Yinger Sag, Jiuquan Basin

高岗 王银会 柳广弟 陈建军 周一博 周在华 杨智明

Gao Gang Wang Yinhui Liu Guangdi Chen Jianjun Zhou Yibo Zhou Zaihua Yang Zhiming

中国石油大学(北京) 地球科学学院, 北京 102249 2. 恒泰艾普石油天然气技术服务 股份有限公司, 北京 100084 3. 中国石油玉门油田公司 勘探开发研究院, 甘肃 酒泉 735019

College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China 2. LandOcean Energy Services Co, Ltd, Beijing 100084, China 3. Research Institute of Exploration and Development, Yumen Oilfield Company, CNPC, Jiuquan, Gansu 735019, China

基于烃源岩生排烃基本原理,利用TOC含量与热解S1,氯仿沥青"A"含量的关系确定了营尔凹陷下白垩统主要层段有效烃源岩的有机碳含量下限值,其中下沟组有效烃源岩的TOC含量下限值为0.8%,赤金堡组为0.6%。与单井的测井TOC含量预测成果相结合,识别并统计了单井有效烃源岩厚度,最终综合层序地层学和沉积相研究成果确定了主要层段有效烃源岩的展布特征。各层段的有效烃源岩均比较发育,其中以赤金堡组厚度最大,其次为下沟组上段。下沟组下段厚度总体偏低,但北部次凹有效源岩厚度最大亦可达250 m,南部次凹最大为200 m。

Based on the basic theory of hydrocarbon generation and expulsion of source rock, TOC content, pyrolysis parameter S1 and chloroform bitumen "A" content have been correlated to confirm the lowest limit of TOC content of effective source rocks from the Lower Cretaceous in the Yinger Sag. The lowest limit of TOC content of effective source rocks from the Xiagou Formation is 0.8%, while that from the Chijinbu Formation is 0.6%. Combining with the prediction from TOC content by single well logging, the thickness of effective source rock in single well has been calculated. The distribution of effective source rock in main layers has been confirmed combining the studies of sequence stratigraphy and sedimentology. Effective source rocks are well-developed in each layer, among which those in the Chijinbu Formation have the biggest thickness, and the Upper Xiagou Formation the second. In the Lower Xiagou Formation, effective source rocks are thin; however, they may increase to 250 m thick in the northern subsag, and 200 m thick in the southern subsag.

中石油玉门油田分公司科技项目"酒泉盆地东部油气富集规律与有利勘探方向"(Y2010JF8-04)资助。

https://doi.org/10.11781/sysydz201304414