下寺湾油田Y油区长6油藏油气成藏条件分析  

Analysis of Oil and Gas Accumulation Conditions in Chang 6 Reservoir of Y Oil Field in Xiasiwan Oilfield

作　　者：杨维[1] 张伟[1] 谢利成[1] 杨蒙 张道亮 代嘉霖 YANG Wei;ZHANG Wei;XIE Licheng;YANG Meng;ZHANG Daoliang;DAI Jialin(Exploration and Development Technology Research Center,Yanchang Oilfield Co.,Ltd,Yan an 716000,China)

机构地区：[1]陕西延长油田股份有限公司勘探开发技术研究中心,陕西延安716000

出　　处：《云南化工》2025年第3期107-110,共4页Yunnan Chemical Technology

摘　　要：针对研究区长6油藏成藏背景、油藏特征认识不清等问题,研究利用分析化验、测井、试油等资料对研究区的油藏特征、油气成藏条件进行分析,研究结果表明:1)研究区长6油藏为岩性油藏,储层物性差,岩性以长石砂岩为主,主要的孔隙类型为溶蚀孔隙,并发育少量微裂缝,为油气富集提供了有利储集空间;2)研究区长73层烃源岩厚度大且稳定分布,同时发育长6油层组水下分流河道砂体储层与长4+5短期湖泛暗色泥岩盖层优势储盖组合,具有大型连通孔隙、砂体叠置点及微裂缝形成的通道体系以及生烃作用产生的异常高压,成藏条件优越;3)下寺湾油田Y油区属下生上储型超压驱动致密油成藏,具备形成一定规模油层的潜力,为下一步区块评价和有利区预测提供依据。In response to the problems of unclear understanding of the background and characteristics of the Chang 6 oil reservoir in the study area,this study analyzed the reservoir characteristics and oil and gas accumulation conditions of the study area using analysis,laboratory testing,logging,and oil testing data.The research results showed that:1)The Chang 6 oil reservoir in the study area is a lithological reservoir with poor physical properties,mainly composed of feldspar sandstone,with dissolution pores as the main pore type and a small number of micro cracks developed,providing favorable storage space for oil and gas enrichment;2)The research area has 73 layers of hydrocarbon source rocks with large thickness and stable distribution.At the same time,there is a favorable combination of underwater distributary channel sand reservoirs in the Chang 6 oil layer and short term lake flooding dark mudstone cap rocks in the Chang 4+5 oil layer.It has a channel system formed by large connected pores,sand body stacking points,and micro cracks,as well as abnormal high pressure generated by hydrocarbon generation,providing superior reservoir conditions;3)The Y oil area of Xiasiwan Oilfield has the potential to form a certain scale of oil reservoirs driven by overpressure in the lower generation and upper storage type,providing a basis for the next block evaluation and favorable area prediction.

关 键 词：油藏特征 长6油藏 烃源岩 油气成藏条件 成藏模式 

分 类 号：TE122[石油与天然气工程—油气勘探]