松辽盆地大安油田扶余油层储层特征及控制因素  

Reservoir characteristics and influential factors of Fuyu Reservoirs in Daan Oil Field,Songliao Basin,China

作　　者：史超群[1] 鲍志东[1] 方松[1] 陶醉[1] 窦鲁星[1] 姚婷婷[1] 杨尚锋 杨益春[1] 

机构地区：[1]中国石油大学(北京)地球科学学院/油气资源与探测国家重点实验室,北京102249

出　　处：《西北大学学报（自然科学版）》2014年第6期959-969,共11页Journal of Northwest University（Natural Science Edition）

摘　　要：利用普通薄片、铸体薄片、X射线衍射、扫描电镜、阴极发光等资料,综合分析松辽盆地大安油田扶余油层储集砂岩的成岩作用、物性特征和孔隙演化过程。研究表明,储集层砂岩主要为岩屑质长石砂岩和长石质岩屑砂岩,以粉细粒为主,主要发育原生粒间孔、粒内溶孔、粒间溶孔和少量微裂缝,孔隙结构差,储层物性差,属于低孔低渗储层。储层经历了压实、压溶、胶结、交代和溶蚀等成岩作用过程,储层胶结物类型多,包括各种黏土矿物胶结、碳酸盐胶结、硅质胶结、长石胶结和黄铁矿胶结等,主要处于中成岩A期成岩阶段。储层特征主要受到沉积、成岩作用影响:沉积作用控制着有利储层(水下)分支河道砂体的分布和原始孔隙度,储层物性与沉积物原始粒度中值、分选系数、杂基含量等沉积参数有明显的相关性;压实作用是研究区储层物性最主要的破坏作用;胶结作用一方面作为骨架支撑颗粒,抵御了部分压实作用的影响,另一方面也成为堵塞储层孔隙的物质;溶蚀作用在一定程度上提高了储层的孔隙度,连通了部分孔隙,增加了油气运移的通道。The diagenesis and porosity evolution of Fuyu Reservoirs in Daan Oil Field were analyzed using thin-sections, casting thin-sections, X-ray diffractometry, scanning electron micrograph observations, and other data. The sandstones consist mainly of lithic arkoses and feldspatic litharenites, with silt and fine sand. Pores consist of primary pores and inter-granular dissolved and intra-granular dissolved pores and a bit of microfractures, with disadvantageous pore configuration and poor property, belonging to low porosity and low permeability. The sediments have been going through compaction, cementation, metasomatic replacement, dissolution and other reactions, with variety of cementations, such as clay mineral cementation, carbonate cementation, siliceous cementation, feldspar cementation and pyrite cementation. Sandstone reservoirs are currently at the medium A period. Reservoir characteristics are mainly controlled by deposition and diagenesis. Sedimentation dominates the distribution of favorable reservoirs named underwater distributary channel sand bodies and the original porosity. Reservoir properties and deposition parameters （such as median grain diameter, sorting coefficient, and content of matrix） correlated significantly. Compaction is the main damaging effects to the res- ervoir properties in the study area, cementation the second, and cementation the third. Cements on the one hand resist the effects of partial compaction as framework support particles, qn the other hand clog he pores of reservoir. Dissolution not only improves the porosity reservoir at a certain extent, but also connects part of the pores and increases hydrocarbon migration path.

关 键 词：松辽盆地 扶余油层 成岩作用 储层性质 沉积参数 

分 类 号：P512.2[天文地球—地质学]