松辽盆地三肇地区砂岩储层孔隙演化特征

SANDSTONE RESERVOIRS PORE EVOLUTIONCHARACTERISTICS 3-ZHAO AREA, SONG LIAO BASIN

本文从三个方面对三肇地区砂岩储层中孔隙结构及演化特征进行了综合研究。并根据薄片、铸体薄片定量分析、热台包裹体测温、X射线衍射粘土分析、电镜扫描、压泵测孔、阴极发光等10项岩心分析资料,论述了砂岩储层中孔隙类型、次生孔隙成因及控制因素,纵向分布及在不同成岩阶段孔隙演化形态。指出了砂岩储层在成岩过程中有利次生孔隙的形成条件。同时获得了次生粒间扩大孔隙空间均可在进一步成岩作用中演化成次生粒间缩小孔隙的新认识。并对该区勘探有利储层部位进行了预测。

<ABSTRACT> From three aspects this paper makes a composite study of the pore structure and its evolutional features of the sandstone reservoirs in 3-Zhao area, and, according to the ten items of the core analytic material, expounds the types of pores the origins and controlling factors of the induced porosity, the vertical distribution and the evolutional forms of the pores in various diagenetic stages in the sandstone reservoirs .These items are the thin section analysis, quantitative analysis of casted thin sections, measuring temperature at hot stage wrapped body, clay analysis by X-ray diffraction, scanning with electron microcsopc, measuring pores with pressurized mercury, cathodolumincsccne, ctc.It indicates that during rock formation the sandstone reservoirs are in favour of the condition for the for mation of induced porosities. Meanwhile a new cognition is obtained that during further diagcnesis the enlargement of the pore space between secondary grains can also cvolve into the decrease the pore space between secondary grains.lt also sprediet the favorable reservoir position to be explored in this area.