渤海湾盆地辫状河三角洲沉积与深部储集层特征——以南堡凹陷南部古近系沙一段为例  

Braided river delta deposition and deep reservoir characteristics in Bohai Bay Basin:A case study of Paleogene Sha 1 Member in the south area of Nanpu Sag

作　　者：董月霞[1] 杨赏[2] 陈蕾[2] 王琦[2] 曹中宏[2] 

机构地区：[1]中国石油冀东油田公司 [2]中国石油冀东油田公司勘探开发研究院

出　　处：《石油勘探与开发》2014年第4期385-392,共8页Petroleum Exploration and Development

基　　金：国家重大科技专项(2011ZX05006)

摘　　要：利用岩心、常规薄片、铸体薄片和扫描电镜等分析化验资料,结合常规物性分析对渤海湾盆地南堡凹陷南部沙一段辫状河三角洲砂岩储集层物性、储集空间类型进行系统研究,探讨南部物源区沙一段储集层特征及其控制因素,揭示沙一段在深层(4 000 m以深)形成优质高产储集层的原因。研究区沙一段砂岩储集层岩性主要为砂砾岩、含砾不等粒砂岩和中—粗砂岩,岩石类型以岩屑质长石砂岩为主,石英、变质岩岩屑等刚性颗粒含量较高,杂基含量少,颗粒支撑;储集层平均孔隙度为12.8%,平均渗透率为154.9×10-3μm2,为低孔、中高渗型;储集空间以原生孔隙和次生溶蚀孔为主。母岩类型、沉积环境和沙一段异常高压是控制储集层物性的主导因素。推测渤海湾盆地4 000 m以深广泛发育具有较高自然油气产能的优质砂岩储集层,常规砂岩油气藏勘探有望进一步向深部拓展。Based on the core description, conventional thin section, cast thin section and scanning electron microscope （SEM） analysis, combined with the general physical analysis, the physical properties of the braided river delta sandstone reservoirs and the types of reservoir space of Sha 1 Member, Paleogene Shahejie Formation, have been analyzed in the southern Nanpu Sag of the Bohai Bay Basin. The characteristics and controlling factors of the southern provenance of Sha 1 reservoirs are examined to reveal the causes for the formation of deep high-quality reservoirs （more than 4 000 m）. Sha 1 reservoirs in the study area are the gravel rock, pebbled inequigranular sandstone, medium sand, and gritrock. The lithology is mainly lithic feldspar sandstone, the contents of rigid particles like quartz and metamorphic rock cuttings are higher, the content of matrix is very low, the structure is particle support. The average porosity is 12.8%. The average permeability is 154.9×10^-3μm2. The reservoir type is low porosity and high permeability. The reservoir space is mainly primary pores and secondary pores. Parent rock type, sedimentary environment and the abnormal high pressure in the Sha 1 Member are the dominant factors controlling the reservoir properties. It is inferred that high quality sandstone reservoirs with high natural productivity ofoil and gas are widely developed in the strata more than 4 000 m deep in the Bohai Bay Basin, the conventional sandstone reservoir exploration is expected to expand to the deep.

关 键 词：渤海湾盆地 南堡凹陷 沙一段 辫状河三角洲 深层 储集层特征 

分 类 号：TE122[石油与天然气工程—油气勘探]