鄂尔多斯盆地曾岔地区延安组和延长组储层特征对比分析

发布时间：2018-04-13 02:00

本文选题：储层特征 + 储层物性影响因素　；参考：《西安科技大学学报》2017年05期

【摘要】：厘清储层的宏观结构和微观物性特征对油藏勘探开发意义重大。针对近年来不断有新油藏发现但研究程度较低的曾岔地区,利用大量岩石薄片、扫描电镜、阴极发光和物性分析等资料,结合沉积砂体展布特征,对延安组和延长组储层特征及其控制因素进行了对比分析。研究表明:延安组和延长组分别以中-细粒石英砂岩和细粒长石砂岩为主,延长组胶结物含量总体大于延安组,其中以方解石和绿泥石最为发育;储集空间以粒间孔为主,其次为长石溶孔、岩屑溶孔和晶间溶孔,其中延安组储层孔隙结构好,物性明显优于延长组,在延长组中,长6好于长4+5,长7和长9油层组。曾岔地区储层的发育受宏观沉积作用和微观成岩作用的共同影响,辫状河中边滩和心滩砂体物性一般好于主河道,三角洲前缘中水下分流河道砂体物性一般好于水下天然堤;压实和胶结作用对延长组储层物性的破坏程度较延安组大,但溶蚀作用延长组较延安组发育,溶蚀产生的次生溶孔是延长组储层物性改善的主要途径;储层中碳酸盐胶结物含量普遍较高,由于其后期溶蚀作用较弱,因此碳酸盐对储层物性的破坏性尤为明显。
[Abstract]:It is of great significance to clarify the macroscopic structure and microscopic physical properties of reservoir for reservoir exploration and development.In view of the Zengcha area, where new reservoirs have been continuously discovered in recent years, the distribution characteristics of sedimentary sand bodies are combined with a large amount of rock sheet, scanning electron microscope, catholuminescence and physical properties analysis, etc.The reservoir characteristics and controlling factors of Yan'an formation and Yanchang formation are compared and analyzed.The results show that the Yanan formation and Yanchang formation are mainly medium-fine-grained quartz sandstone and fine-grained feldspathic sandstone respectively. The cementation content of Yanchang formation is higher than that of Yan'an formation, in which calcite and chlorite are the most developed, and intergranular pore is the main reservoir space.Secondly, feldspar dissolved pore, cuttings dissolved pore and intergranular dissolved pore, among which the reservoir pore structure of Yan'an formation is good, and physical property is obviously superior to Yanchang formation. In Yanchang formation, Chang 6 is better than Chang 45, Chang 7 and Chang 9 reservoirs.The reservoir development in Zengcha area is affected by both macro sedimentation and micro diagenesis. The physical properties of the beach and core beach sand bodies in braided river are generally better than those of the main channel, and the physical properties of the sand body in the delta front subaqueous distributary channel are generally better than those in the underwater natural embankment.Compaction and cementation have more damage to reservoir physical properties of Yanchang formation than Yan'an formation, but the dissolution of Yanchang group is more developed than Yan'an formation, and the secondary dissolution pore produced by dissolution is the main way to improve reservoir physical properties of Yanchang formation.The carbonate cement content is generally high in the reservoir, because of its weak dissolution in the late stage, the carbonate is especially destructive to the reservoir physical properties.
【作者单位】：陕西延长石油(集团)有限责任公司研究院;
【基金】：陕西延长石油(集团)有限责任公司科技项目(ycsy2015ky-B-06)
【分类号】：P618.13

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