苏北海安凹陷泰州组角岩储集层特征及溶孔成因  

RESERVOIR FEATURE AND THE ORIGIN OF DISSOLVE PORES IN THE HORNFELS IN TAIZHOU FORMATION IN HAIAN SAG, NORTHERN JIANGSU PROVINCE

作　　者：黄善炳 

机构地区：[1]江苏石油勘探局地质科学研究院

出　　处：《石油勘探与开发》1994年第5期94-99,共6页Petroleum Exploration and Development

摘　　要：本文对苏北海安凹陷中生代泰州组辉绿岩侵入使围岩变质的角岩储集体特征和溶孔成因进行了较为系统的研究。认为角岩储集体具有良好的储集性能，其最大孔隙度为２６．３％，最大渗透率为５．１×１０￣（－３）μｍ￣２，均高于邻近的砂岩储层。铸体薄片和扫描电镜等资料反映，角岩中溶孔发育，裂隙次之，属溶蚀孔隙型储集岩。论述了溶蚀作用在深埋期进行，溶质来自生油岩的有机酸和碳酸，角岩中不稳定的铝硅酸盐和碳酸盐矿物是产生溶孔的物质基础。另外，构造裂隙及生、储层上下错动，为酸性溶液运移提供了通道，对次生溶孔的形成起到重要作用。The hornfels in diabase intrusive body in the Mesozoic Taizhou formation in the Haian sag, northern Jiangsu province has considerable porosity t up to 26% and a rather permeability up to 5×10￣(-3)μm￣2. Both of them are higher than those in the neighbouring sandstone reservoir. This paper gives a systematic study of its reservoir features and origin of solution pores. As indicated by cast thin section and ESM study, solution pores developed mainly in hornfels and fracture systems come to be the next. Thus, this is a solution pore reservoir. Dissolution occured mainly in the age of deep burial, solvent is the organic acid and carbonic acid derived from source rocks and a alumine silicates and carbonates are the material basis for the formation of solution pores. In addition, structural fissures and the relative upward and downward movement of the source rocks and reservoir rocks gives channels for the flow of acidic liquids. This gives an important role on the formation of secondary porosity.

关 键 词：储集层 溶孔 成因 孔隙 油气勘探 

分 类 号：P618.130.2[天文地球—矿床学]