鄂尔多斯盆地马岭地区长8段油藏主控因素  

Major control factors of oil accumulation of Chang 8 reservoir in Maling area,Ordos Basin,China

作　　者：叶博[1,2] 宋娟[1,2] 张居增[1,2] 曹润荣[1,2] 梁晓伟[1,2] 王炯[1,2] YE Bo;SONG Juan;ZHANG Juzeng;CAO Runrong;LIANG Xiaowei;WANG Jiong(Eccploration and Development Research Institute of PetroChina,Changqing Oil field Company Xi＇an 710018,China;National Engineering Laboratory of Excploration and Development of Low-Permeability Oil-Gas Field,Xi＇an 710018,China)

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,西安710018 [2]低渗透油气田勘探开发国家工程实验室,西安710018

出　　处：《成都理工大学学报（自然科学版）》2018年第5期529-538,共10页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金："十三五"国家油气重大专项(2016ZX05046);国家自然科学基金重大项目(41390451)

摘　　要：探讨鄂尔多斯盆地马岭地区上三叠统延长组第8段石油富集的主要控制因素。通过大量的钻探、分析化验资料,对长81和长82亚段的沉积、储层、油藏特征进行了对比研究。结果表明长7段烃源岩控制了长8段油藏的分布范围;烃源岩在主要生烃期形成的过剩压力为石油运移到长8段储集层的主要动力;长81油藏富集于水下分流河道微相和长石溶蚀成岩作用形成的相对高渗砂体,长82油藏主要分布于滩坝微相和绿泥石膜胶结作用形成的相对高渗储集层。近源和优势砂体的有效组合是长81油藏大面积分布的主控因素,裂缝和相对高渗砂体配置是长82油藏富集的关键。针对该区长8油藏的勘探思路是:自东向西推进,长81亚段追踪优势砂体,长82亚段寻找高渗砂带。The Member 8 of Upper Triassic Yanchang Formation （Chang 8） reservoir is divided into two sections of Chang 81 and Chang 82 in Maling area, Ordos Basin. Based on the data of drilling cores and experiments, the characteristics of deposition, reservoir and oil accumulation of the Chang 81 and Chang 82 are studied through the comparative analyses, so as to determine the control factors of oil accumulation of Chang 8 reservoir in Maling area. It shows that the distribution range of Chang 8 reservoir is controlled by Chang 7 hydrocarbon source rocks. The excess pressure generated by Chang 7 hydrocarbon source rocks in the main hydrocarbon generation period was the main driving force for the oil migration to Chang 8 reservoir. The Chang 81 reservoir is accumulated in the relatively high permeability sand body formed by the underwater distributary channel microfacies and feldspar dissolution, while the Chang 82 reservoir is mainly located in the relatively high permeability sandstone formed by beach bar microfacies and chlorite cementation. The main control factor of widespread distribution of Chang 81 reservoir is the effective combination of favorable sandstones and proximal sources, while the combination of cracks and relatively high permeability sandstone is very important for the accumulation of Chang 82 reservoir. It is suggested that the strategy of Chang 8 reservoir exploration is working from the east to west area, meanwhile tracking favorable sand body in Chang 81 section and looking for high permeability sandstones in Chang 82 section.

关 键 词：鄂尔多斯盆地 延长组 主控因素 成藏条件 成藏模式 

分 类 号：TE122.31[石油与天然气工程—油气勘探]