鄂尔多斯盆地南部三叠系延长组泥岩压实特征  

Mudstone Compaction Features of Yanchang Formation of the Triassic in the Southern of Ordos Basin

作　　者：杨超 雷裕红[2] Yang Chao;Lei Yuhong(Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an, Shaanxi 710065, China;Institute of Geology and Geophysics, CAS, Beijing 100726, China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [2]中国科学院地质与地球物理研究所,北京100722

出　　处：《非常规油气》2018年第6期24-28,共5页Unconventional Oil & Gas

基　　金：国家自然科学基金项目"深层-超深层高温高压油气成藏规律;关键技术及目标评价"(41172122)资助

摘　　要：为了明确鄂尔多斯盆地南部三叠系延长组泥岩压实特征,明确泥岩压实效应,本文通过对大量录井、测井数据的统计和分析,对盆地南部三叠系延长组泥岩压实特征进行了详细研究。研究认为,泥岩压实总体上具有平面上分区、纵向上分段的特征。纵向上,长6及其以上地层为正常压实段,富县地区欠压实发育在长7油层组及长9油层组泥岩地层内,其中长7油层组欠压实程度最大,长9油层组次之,长8油层组处于过渡段;而旬邑及黄陵地区欠压实主要发育在长7油层组内。平面上,富县地区泥岩压实曲线最平缓,旬邑地区次之,黄陵地区泥岩压实曲线最为陡倾。从西向东,欠压实顶界深度由深到浅,欠压实的程度逐渐变小。以上成果认识,对后续地层剥蚀厚度估算、孔隙流体压力计算、反演盆地演化分析等奠定了一定的理论基础。In order to find out characteristics of mudstone compaction of Yanchang formation in the southern Ordos basin,clarity the effect of mudstone pressure,based on the statistics and analysis of a large number of logging data,a detailed study on the characteristics of mudstone compaction Yanchang formation of the Triassic in the southern of the basin.The results showed that the mudstone compaction have the characteristics of north-south difference and longitudinal subsection.Longitudinal,Chang-6 reservoir group and its above strata normal compaction,undercompacted strata develop in Chang-7 reservoir group and Chang-9 reservoir group in Fuxian region,the degree of compaction is the largest in Chang-7 reservoir group,and Chang-9 reservoir group is secondary,Chang-8 reservoir group is in the transition section.Undercompacted strata mainly develop in Chang-7 reservoir group in Xunyi and Huangling area.On the plane,the mudstone compaction curve is the gentlest in Fuxian area,and Xunyi area is secondary,and the mudstone compaction curve is steepest in Huangling area.And from the west to the east,the depth of the undercompacted roof is gradually reduced from deep to shallow,and the degree of underpressure is gradually becoming smaller.Based on the above results,the theoretical foundation is established for the calculation of the subsequent strata denudation thickness,the calculation of pore fluid pressure and the evolution analysis of the inversion basin.

关 键 词：鄂尔多斯盆地南部 三叠系 延长组 泥岩压实 

分 类 号：TE122[石油与天然气工程—油气勘探]