山东省牛庄洼陷古近系沙河街组沙三中亚段储集层成岩作用研究  

Reservoir Diagenesis of the Intermediate Section in Member 3 of Shahejie Formation(Paleogene) in Niuzhuang Sub-sag, Shandong Province

作　　者：漆滨汶[1] 林春明[1] 邱桂强[2] 李艳丽[1] 刘惠民[2] 高永进[2] 茅永强[3] 

机构地区：[1]南京大学成矿作用国家重点实验室地球科学系,南京210093 [2]胜利油田有限公司地质科学研究院,山东东营257015 [3]中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室,南京210008

出　　处：《沉积学报》2007年第1期99-109,共11页Acta Sedimentologica Sinica

摘　　要：山东省牛庄洼陷古近系沙河街组沙三中亚段储集层岩石类型以长石岩屑砂岩和岩屑长石砂岩为主,岩石结构成熟度和成分成熟度均较低。砂岩成岩作用包括压实作用、胶结作用、交代作用、溶解作用等。压实作用主要有刚性颗粒发生脆性破裂、颗粒之间呈线接触和凹凸接触、岩石碎屑颗粒呈明显的定向排列、塑性颗粒挤压变形或刚性颗粒嵌入变形颗粒中、粘土质碎屑被挤压变形发生假杂基化等五种表现形式。胶结物主要有泥质胶结物、碳酸盐胶结物、自生粘土矿物和自生石英、长石。交代作用主要有石英交代长石颗粒、碳酸盐胶结物交代石英、长石及岩屑颗粒、碳酸盐胶结物之间的相互交代。发生溶解作用的主要是石英、长石和岩屑颗粒,胶结物中主要是碳酸盐矿物。目前研究区沙三中亚段储集层成岩演化处于晚成岩A期。影响成岩作用的主要因素为岩石成分、沉积环境、孔隙流体性质等。成岩作用对储集物性的影响主要表现在孔隙度和渗透率的变化,其中压实作用和胶结作用使储层原生孔隙迅速减少、渗透率降低,使得储集物性变差;而溶解作用是次生孔隙发育的主要因素,从而改善砂岩的储集性能。Reservoir rocks of the intermediate section Sub -sag of Member 3 of Shahejie Formation of Paleogene in Niuzhuang , Shandong Province, mainly consists of feldspathic litharenite and litharenite arkose with low compositional maturity and textural maturity. Diagenesis of the sandstones includes compaction, cementation, replacement and dissolution. Compaction includes five occurehces, they are brittle cracking of rigid grains, lined and concavo-convex in- tergranular contacts, apparently directional arrangement of framework grains, compressional deformation of plastic grains or intercalation of rigid grains in deformational grains, pseudomatrixization of compressional deformed ductile detrital grains. Cements are argilla, carbonates, authigenic clay minerals, quartz and feldspars. Replacement includes quartz replaced feldspars, carbonate cements replaced quartz, feldspars and lithic fragments, and carbonates cements replaced each other. Dissolution of grains mainly are quartz, feldspars and lithic fragments, and of cements of carbonate minerals. The research result shows that the diagenesis of reservoir rock is in A-substage of telodiagenesis. The main factors which affect the diagenesis of the reservoir include rock composition, sedimentary environment and property of pore fluid. The influences of diagenesis on the reservoir physical properties are mainly the change of porosity and permeability. Compaction and cementation of the reservoir rocks makes the primary pores and permeability decreased quickly, which is the main causes of the poor physical properties; but dissolution of the reservoir rocks is the main factor of the development of the secondary pores, which can improve the physical properties of the reservoir sandstones.

关 键 词：储集层 成岩作用 储集物性 沙三中亚段 古近系 牛庄洼陷 山东 

分 类 号：TE122.2[石油与天然气工程—油气勘探]