摘要
运用钻井岩心、铸体薄片和扫描电镜等资料,对两北地区三叠系深部碎屑岩的储层特征及储层发育的控制因素进行了研究。结果表明,三叠系储层主要岩石类型为长石岩屑砂岩和岩屑砂岩,具有成分成熟度低和结构成熟度中等的岩石学特征,储集空间以粒间溶孔为主,其次为裂缝,属于中孔、中—低渗透储层。两北地区三叠系主要发育冲积扇—河流—湖泊—三角洲沉积体系,沉积主体为三角洲平原、三角洲前缘亚相及滨浅湖沉积,储集砂体主要为分流河道和河口坝沉积。成岩作用是深部碎屑岩储层后期改造的关键因素,压实作用使得储层原始孔隙遭受破坏; 同时储层中方解石、长石、石英、岩屑及杂基在大气、水和有机酸的溶蚀作用下,产生大量的溶蚀孔隙,改善了储集性能,溶蚀作用是两北地区三叠系形成优质深部碎屑岩储层的关键因素。
Using the date of drilling cores, cast thin slice, scanning electron microscope and so on, the characteristics and control factors of the Triassic clastic reservoirs in Liangbei region are studied. The rock type is dominantly the feldspar sandstone and debris sandstone, with the petrological characteristics of low compositional maturity and medium textural maturity, and the reservoir spaces are mainly intergranular dissolution pores, secondly cracks, and it is medium porosity to low-medium permeability reservoir. The main sedimentary system in the study area is alluvial fan-rivers-lakes-delta system, the main sedimentary bodies are delta plain, delta front, lakeside and shallow facies. Reservoir sand bodies are distributary channel and estuary dam. The key factor of reforming the deep-buried clastic rock reservoirs is diagenesis, and the primary porosity suffers a great reduction by compaction; Due to the atmospheric water and organic acid, the calcite, feldspar, rock fragment, quartz and miscellaneous matrix experience dissolution, and a lot of dissolution pores increased reservoir property of deep clastic rocks. Dissolution is the key factor favoring the occurrence of high quality reservoir.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2012年第4期10-13,111-112,共4页
Petroleum Geology and Recovery Efficiency
关键词
储层特征
控制因素
碎屑岩
三叠系
两北地区
reservoir characteristics
control factors
clastic rock
Triassic
Liangbei area
作者简介
张玉玺，女，在渎硕士研究生，从事石油及天然气地质研究。联系电话：13207193837，E-mail：zhyx0829@163．com。
