鄂尔多斯盆地陇东地区延长组非主力有效烃源岩发育特征  

Development characteristics of non-main effective source rocks of the Yanchang Formation in eastern Gansu Province of Ordos Basin

作　　者：姚泾利[1] 高岗[2,3] 庞锦莲[1] 刘凤妍[4] 柳广弟[2,3] 张雪峰[1] 马海勇[1] 独育国[1] 程党性[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,陕西西安710021 [2]油气资源与探测国家重点实验室 [3]中国石油大学(北京)地球科学学院,北京102249 [4]华北油田分公司地球物理勘探研究院,河北任丘062552

出　　处：《地学前缘》2013年第2期116-124,共9页Earth Science Frontiers

基　　金：中国石油天然气股份有限公司长庆油田分公司项目"鄂尔多斯盆地陇东地区三叠系延长组石油成藏条件及富集规律研究"(KT2009-10)

摘　　要：通过油源对比确定了鄂尔多斯盆地陇东地区延长组长4+5、长6、长9暗色泥岩和长7油页岩与暗色泥岩的有效性,进一步采用热解烃指数(HCI)、可溶有机质与有机碳含量关系确定了有效烃源岩的有机碳含量下限为1.1%。以此下限值作为标准,与单井测井资料预测的有机碳含量值结合,确定了单井不同层段有效烃源岩的厚度。通过大量钻井有效烃源岩的厚度统计,确定了不同层段有效烃源岩的厚度分布特征。长4+5有效烃源岩主要分布在研究区中部,最大厚度超过60m。长6有效烃源岩的分布中心集中在庆城—马岭一带,最大厚度超过70m,沉积中心的厚度在20～70m,分布范围与长7油页岩的分布较为一致。长9有效烃源岩在东北部的志丹地区,主体厚度在30～60m。In this study, first, by oil-source correlation, the effectiveness of oil shale and dark mudstone was determined in the Chang 4＋5, 6 and 9 layers of the Yanchang Formation in the eastern Gansu Province, Ordos Basin, and next, by relation of TOC content with pyrolysis hydrocarbon index（HCI） and insoluble organic matter, the low limit of TOC content of source rock for effective expulsion was determined to be 1. 1%. According to this low limit value, the thickness of effective source-rock of different layers was identified by incorporation of measured TOC and calculated TOC in single wells. Effective source-rock of the Layer 4＋ 5 distributes mainly in the center section of the study area, over 60 m thick at the thickest point. Effective source-rock of the Layer 6 distributes in Qingcheng- Maling area, over 70 m thick at the thickest point and has a similarity with the distribution trend of oil shale of the Layer 7. The effective source-rock of the Layer 9 with the thickness from 30 m to 60 m distributes in the Zhidan area in the northeast of the study area.

关 键 词：有机质丰度下限值 有效烃源岩 延长组 陇东地区 鄂尔多斯盆地 

分 类 号：P618.130.2[天文地球—矿床学]