鄂尔多斯盆地周家湾地区长8致密砂岩储层特征及影响因素

发布时间：2018-01-15 01:37

本文关键词：鄂尔多斯盆地周家湾地区长8致密砂岩储层特征及影响因素　出处：《岩性油气藏》2017年01期 　论文类型：期刊论文

【摘要】：鄂尔多斯盆地周家湾地区三叠系延长组长8致密砂岩储层特征和优质储层控制因素研究薄弱,制约了该区油气的勘探与开发进程。在岩心观察的基础上,结合大量铸体薄片、扫描电镜、压汞及常规物性等分析化验资料,对周家湾地区长8致密砂岩储层的宏观和微观特征及其影响因素进行了研究。结果表明,长8储层岩石类型以岩屑长石砂岩和长石岩屑砂岩为主,填隙物含量较高;长81和长82小层的孔隙度分别为8.03%和8.17%,渗透率分别为0.17 mD和0.25 mD,均属致密砂岩储层,储层物性较差;储集空间以剩余原生粒间孔和次生长石溶孔为主,微细喉道,形成了长8储层高排驱压力、高中值压力及低退汞效率的特征。受沉积和成岩作用的共同控制,研究区长8油层组有利储层主要发育于分流河道和水下分流河道沉积微相中,压实作用、碳酸盐胶结作用和硅质胶结作用致使储层物性变差,溶蚀作用则有效改善了储层孔渗条件。
[Abstract]:The study on the characteristics of tight sandstone reservoir and the control factors of high quality sandstone in the Triassic Yanchang formation 8 in Zhoujiawan area, Ordos Basin, is weak, which restricts the exploration and development of oil and gas in this area, on the basis of core observation. The macroscopical and microcosmic characteristics and influencing factors of Chang 8 tight sandstone reservoir in Zhoujiawan area were studied by combining with a large number of casting thin sheet, scanning electron microscope, mercury injection and conventional physical properties analysis and laboratory data. The rock types of Chang 8 reservoir are mainly lithic feldspathic sandstone and feldspathic sandstone with high content of interstitial material. The porosity and permeability of Chang81 and Chang82 are 8.03% and 8.17, respectively. The permeability is 0.17mD and 0.25mD, which are both tight sandstone reservoirs, and the physical properties of the reservoirs are poor. The reservoir space is dominated by residual primary intergranular pore and secondary growth pore with fine throat, forming the characteristics of high displacement pressure, high value pressure and low mercury removal efficiency of Chang 8 reservoir, which are jointly controlled by sedimentation and diagenesis. The favorable reservoir of Chang 8 reservoir in the study area is mainly developed in the sedimentary microfacies of distributary channel and underwater distributary channel. Compaction carbonate cementation and siliceous cementation result in poor physical properties of reservoir. Dissolution can effectively improve the reservoir porosity and permeability conditions.
【作者单位】：中国石油长庆油田分公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;中国石油长庆油田分公司西安长庆化工集团有限公司;
【基金】：国家重大科技专项“鄂尔多斯盆地致密油资源潜力、甜点预测与关键技术应用”(编号:2016ZX05046-005)资助
【分类号】：P618.13
【正文快照】： 0引言近些年,随着岩性油藏成藏理论的不断发展完善以及勘探思路的转变,相继在鄂尔多斯盆地延长组长8油层组发现了西峰、姬塬和环江等亿吨级大油田。与这些大油田的成藏条件相比,鄂尔多斯盆地周家湾地区长8油层组同样具备紧邻长7烃源灶、规模大且连续性较好的三角洲前缘砂体可

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