鄂尔多斯盆地甘谷驿油田长6段低渗储层孔隙微观发育特征及成岩演化

发布时间：2018-05-04 11:11

本文选题：孔隙结构 + 成岩作用　；参考：《西安石油大学学报(自然科学版)》2016年06期

【摘要】：针对甘谷驿油田长6段低孔低渗储层,结合区域沉积及地质资料,充分利用岩石薄片分析、压汞及扫描电镜分析,系统研究了该储层孔隙发育类型及特征、孔隙结构划分及孔隙演化机理。研究结果表明,长6段储层岩性以长石砂岩为主,孔隙度约10%,渗透率在(0.1~2.0)×10~(-3)μm~2,孔隙类型主要为残余粒间孔,其次为粒间溶孔、粒内溶孔及胶结物溶孔,局部发育微裂隙及晶间孔隙,总面孔率在5%左右。另外,依据孔隙结构参数及J函数法,将孔隙结构划分为4种类型。孔隙的发育特征与成岩作用密切相关,压实压溶作用、胶结充填作用、溶蚀作用对后期的孔隙演化均有重要作用,早期的成岩阶段以压实及胶结作用为主,形成原生残余粒间孔隙,而在成岩阶段后期,次生孔隙发育,形成2种类型次生孔隙,即浊沸石溶蚀孔以及绿泥石、水云母溶蚀形成的溶蚀孔。
[Abstract]:In view of the low porosity and low permeability reservoir of Chang 6 member in Gangguyi Oilfield, combined with regional sedimentary and geological data, the pore development types and characteristics of the reservoir are systematically studied by making full use of rock thin slice analysis, mercury injection and scanning electron microscope analysis. Pore structure division and pore evolution mechanism. The results show that the lithology of Chang 6 reservoir is dominated by feldspathic sandstone with porosity of about 10 and permeability of 0. 1 ~ 2 脳 10 ~ (-3) 渭 m ~ (-3) 渭 m ~ (-2). The pore type is mainly residual intergranular pore, followed by intergranular dissolved pore, intragranular dissolved pore and cemented dissolved pore, local microfracture and intergranular pore. The total face rate was about 5%. In addition, according to the parameters of pore structure and J function method, the pore structure can be divided into four types. The characteristics of pore development are closely related to diagenesis. Compaction, cementation, cementation and dissolution play an important role in the evolution of pores in the later stage, and the early diagenesis stage is dominated by compaction and cementation. The primary residual intergranular pores were formed, while in the late diagenetic stage, secondary pores developed, forming two types of secondary pores, that is, the dissolution pores of zeolite and chlorite, and the dissolution pores formed by the dissolution of hydromica.
【作者单位】：西南石油大学地球科学与技术学院;延长油田股份有限公司甘谷驿采油厂;
【基金】：国家自然科学基金青年项目(编号:41502107)
【分类号】：P618.13;TE31

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