基于源储条件的致密油富集因素与有利区预测——以鄂尔多斯盆地周长地区延长组下组合为例  

Tight oil enrichment factors and prediction of favorable areas based on source and reservoir conditions: taking the lower combination of Yanchang Formation in Zhouchang area of Ordos Basin as an example

作　　者：张小奇[1] 白江[1] 赵小春 马荣 双立娜[1] 杨可欣 吴伟涛 ZHANG Xiaoqi;BAI Jiang;ZHAO Xiaochun;MA Rong;SHUANG Lina;YANG Kexin;WU Weitao(Wuqi Oil Production Plant,Yanchang Oilfield Co.,Ltd.,Yan′an 717600,China;No.5 Oil Production Plant,Huabei Oilfield Company,CNPC,Xinji 052360,China;School of Earth Science and Engineering,Xi′an Shiyou University,Xi′an 710065,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi′an 710065,China)

机构地区：[1]延长油田股份有限公司吴起采油厂,陕西延安717600 [2]中国石油华北油田分公司第五采油厂,河北辛集052360 [3]西安石油大学地球科学与工程学院,陕西西安710065 [4]陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《断块油气田》2025年第2期177-184,共8页Fault-Block Oil & Gas Field

基　　金：陕西省创新能力支撑计划项目“非常规油藏低碳环保提高采收率技术创新团队”(2023-CX-TD-31)。

摘　　要：烃源岩和储层条件对致密油富集的影响是石油富集规律研究的重要内容。文中以鄂尔多斯盆地周长地区延长组下组合(长7—长9油层组为主)致密油藏为研究对象,利用测井、钻井、岩心、试油、试采等资料,分析了烃源岩和储层条件,以及其对准连续型致密油藏的控制作用,预测了有利区。研究表明:周长地区下组合储层孔隙度平均为7.1%,渗透率平均为1.22×10^(-3)μm^(2),中值为0.32×10^(-3)μm^(2),属于致密储层,其油藏类型为三角洲前缘背景下形成的透镜状岩性致密油藏,呈现平面连片、纵向叠置的准连续型分布特征。储层孔隙度和泥质质量分数对致密油的控制作用明显,渗透率次之;烃源岩生烃强度的控制作用明显,其次为泥岩厚度。利用油层富集因子预测了下组合致密油的有利区:Ⅰ类有利区8块,面积为23.1×10^(4) km^(2),主要在周长地区南部;Ⅱ类有利区13块,面积为56.2×10^(4) km^(2),分布相对分散。研究成果旨在丰富致密油富集理论的同时,进一步指导致密油的勘探部署。The influence of source rocks and reservoir conditions on tight oil enrichment is an important content in the study of oil enrichment laws.In this paper,the tight oil reservoirs of the lower combination of Yanchang Formation(mainly Chang 7 to Chang 9)in Zhouchang area of Ordos Basin are studied.The source rocks and reservoir conditions are analyzed by using the data of logging,drilling,core,oil test and production test,their controlling effect on the continuous tight oil reservoirs is also analyzed,and the favorable areas are predicted.The results show that:the average porosity of the reservoir in the lower combination Zhouchang area is 7.3%,the average permeability is 1.22×10^(-3)μm^(2),and the median is 0.32×10^(-3)μm^(2),belonging to tight reservoirs.The type of reservoir is lenticular lithologic tight reservoir formed under the background of delta front,showing continuous distribution characteristics of plane connection and vertical superimposition.The porosity and the argillaceous content of the reservoir obviously control the tight oil,followed by permeability.The controlling effect of hydrocarbon generation intensity of source rocks is obvious,followed by the thickness of mudstone.The favorable areas of lower combination tight oil are predicted by using oil formation enrichment factors.There are eight favorable areas of ClassⅠ with an area of 23.1×10^(4) km^(2), mainly distributed in the southern part of Zhouchang area. There are 13 favorable areas of Class Ⅱ with an area of 56.2×10^(4) km^(2), and their distribution is relatively dispersed. The research results aim to enrich the theory of tight oil enrichment and further guide the exploration and deployment of tight oil.

关 键 词：致密储层 致密油 主控因素 有利区预测 延长组 鄂尔多斯盆地 

分 类 号：TE132[石油与天然气工程—油气勘探]