鄂尔多斯盆地东南缘延长组浊沸石胶结物特征及其成岩模式  

Study on the characteristics and diagenesis model of laumontite cement in Yanchang Formation in the southeastern margin of Ordos Basin

作　　者：袁珍 郑艳忠 袁海莉 杨喜彦[4] 李文厚[5] YUAN Zhen;ZHENG Yanzhong;YUAN Haili;YANG Xiyan;LI Wenhou(School of Earth Science and Engineering/Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi′an Shiyou University,Xi′an 710065,China;Zhidan Oil Production Plant,Yanchang Oilfield Co.,Ltd.,Yan′an 717500,China;Exploration and Development Research Institute of PetroChina Qinghai Oilfield Company,Dunhuang 736202,China;Gas Development Deparment of Qinghai Oilfield Company,Dunhuang 736202,China;Department of Geology/State Key Laboratory of Continental Dynamics,Northwest University,Xi′an 710069,China)

机构地区：[1]西安石油大学地球科学与工程学院/陕西省油气成藏地质学重点实验室,陕西西安710065 [2]延长油田股份有限公司志丹采油厂,陕西延安717500 [3]中石油青海油田分公司勘探开发研究院,甘肃敦煌736202 [4]青海油田公司开发处,甘肃敦煌736202 [5]西北大学地质学系/大陆动力实验室,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2020年第1期124-134,共11页Journal of Northwest University（Natural Science Edition）

基　　金：国家科技重大专项资助项目(2017ZX05005-002-004)

摘　　要：通过薄片观察、扫描电镜、电子探针、X衍射等微观分析手段,对鄂尔多斯盆地东南缘延长组发育的浊沸石胶结物进行研究。研究表明,区内发育了受控于东北及南部物源两个方向的沉积体系,浊沸石分布在这两个沉积体系的延长组下组合中的长10,长9油层组中,仅在东北沉积体系浅层长3油层组出现了浊沸石胶结物。结合含浊沸石砂岩的岩石学特征及自生胶结物的赋存状态与其他自生矿物及骨架颗粒之间相互关系,认为研究区延长组浊沸石的形成受控于物源区母岩的特征及成岩流体的演化特征,以此建立浊沸石的成岩模式,明确研究区浊沸石的成因,进一步分析了浊沸石胶结物对延长组储层储集性能的双重影响(即早期堵塞孔隙、晚期因溶蚀而改善储层),为延长组优质储层的预测提供了依据。The laumontite developed in the Yanchang Formation in the southeastern margin of the Ordos Basin were studied by microscopic analysis such as thin section observation,scanning electron microscopy,electron probe and X-ray diffraction.The study shows that the sedimentary system controlled by the northeast and south provenances is developed in the area.The laumontite is distributed in the Chang 10 and Chang 9 oil-bearing formation in these sedimentary system.The laumontite cement is formed in the shallow layer Chang 3 oil-bearing formation of the northeast sedimentary system.Combined with the petrological characteristics of oil-bearing sandstone and the relationship between the occurrence of authigenic cement and other authigenic minerals and skeletal particles,it is believed that the formation of laumontite in the study area is controlled by the parent rock characteristics of the source area and diagenetic fluid.The diagenetic model of laumontite is established,the cause of laumontite in the study area is clarified.And the dual effects of laumontite cement on the reservoir performance of the extended reservoir are further analyzed,that is to say,early blockage of pores and late dissolution due to corrosion.Improving the reservoir provides a basis for prolonging the prediction of high-quality reservoirs.

关 键 词：鄂尔多斯盆地东南缘 延长组 浊沸石 成岩模式 优质储层 

分 类 号：TE121.3[石油与天然气工程—油气勘探]