四川盆地公山庙西地区侏罗系大安寨段致密油储层特征及高产主控因素  

Main controlling factors for the high yield of tight oil in the Jurassic Da’anzhai Section in the western area of Gongshanmiao,Sichuan Basin

作　　者：闫雪莹 桑琴[1] 蒋裕强[1,2] 方锐 周亚东 刘雪 李顺 袁永亮[1] YAN Xueying;SANG Qin;JIANG Yuqiang;FANG Rui;ZHOU Yadong;LIU Xue;LI Shun;YUAN Yongliang(School of Earth Science and Technology,Southwest Petroleum University,Chengdu 610500,China;CNPC Reservoir Evaluation Laboratory,Chengdu 610500,China;Furisheng(Chengdu)Technology Co.,Ltd.,Chengdu 610056;Chuanzhong Oil and Gas Mine of CNPC Southwest Oil and Gas Field Company,Suining 629000,Sichuan,China)

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]中国石油非常规油气重点实验室储层评价实验室,成都610500 [3]福瑞升(成都)科技有限公司,成都610056 [4]中国石油西南油气田公司川中油气矿,四川遂宁629000

出　　处：《岩性油气藏》2024年第6期98-109,共12页Lithologic Reservoirs

基　　金：中国石油-西南石油大学创新联合体项目“中台山—公山庙西大安寨段凉高山组页岩油储层特征及分布规律研究”(编号:2020CX030101)资助。

摘　　要：在致密灰岩储层特征认识的基础上,利用薄片鉴定、测井响应、叠前地震波形指示反演(SMI)等方法对四川盆地公山庙西地区大安寨段致密灰岩储层特征及高产主控因素展开了详细研究。研究结果表明:①四川盆地公山庙西地区大安寨段灰岩储层可分为厚层型和薄层型2种类型。灰岩储层平均孔隙度为1.2%,平均渗透率为0.05 mD,为特低孔、低渗储层,储集空间主要为次生溶孔和微裂缝;②根据断层规模、断穿层位及平面上的断距,将研究区断层分为一级、二级和三级,其中大安寨段主要受一级和二级断层影响,与断层伴生的裂缝体系有效改善了储层物性;③研究区有利相带控制了油气的分布,断储配置关系控制了油藏的产能,可分为“薄层灰岩+一级断缝”与“厚层灰岩+一级/二级断缝”2种高产模式。On the basis of the understanding of the characteristics of tight limestone reservoirs in the Da’anzhai Formation in the western area of Gongshanmiao of Sichuan Basin,the development scale of the fracture system was identified and graded by using the methods of thin section identification,logging response,and SMI And the main controlling factors of tight oil and high yield in the Da’anzhai Member were studied.The results show that:(1)The limestone of the Da’anzhai section is divided into two types of reservoirs:thick-bedded limestone and thin-bedded limestone.The limestone reservoir has an average porosity of 1.2%and an average permeability of 0.05×10-3μm^(2),which is a very low porosity and low permeability reservoir,and dissolution is an important factor in the formation of reservoir properties,and the reservoir space is mainly secondary dissolved pores and micro-fractures.(2)According to the size of the fault,the fault layer and the fault distance on the plane,the fault is divided into primary,secondary and tertiary.Among them,the Da’anzhai section is mainly affected by the primary and secondary faults,the fractures associated with faults can effectively improve the physical properties of the reservoir.(3)It is concluded that favorable facis development and t relationship of fault-reservoir configuration are the control factor to determine the high yield of the reservoir.There are two high-yield models:“thin limestone first-level fracture”and“thick limestone first-level/second-level fracture”.

关 键 词：断缝体系 介壳灰岩 构造缝 成岩缝 有利相带 断储配置关系 大安寨段 侏罗系 公山庙西地区 四川盆地 

分 类 号：TE122[石油与天然气工程—油气勘探] P631.8[天文地球—地质矿产勘探]