松辽盆地北部深层次生孔隙分布特征

通过多种分析测试手段系统研究了松辽盆地深层异常高孔隙带成因，指出深层有机酸是次生孔隙形成的主要因素，T4断层可能成为酸性水运移通道，对次生孔隙的分布具有一定的控制作用；纵向上次生孔隙主要分布于临近T4断层上部的泉头组一段、登娄库组三、四段地层，并具有继承性；平面上分布于升平一汪家屯和昌德地区。次生孔隙形成期与天然气主运聚期具有较好的匹配关系，次生孔隙发育带最有可能成为高产油气层。

Distribution characteristics of secondary pore of deep strata in the northern part of Songliao Basin

By applying many techniques this paper thoroughly studies the formation of high porosity zone in the deep strata of Songliao Basin, it exposes that the type of the secondary pore and its contribution to reservoir.This paper mainly discusses the characteristic of feldspar and laumontite dissolution,the formation and distribution of the secondary pore and its geological significance.This study indicates that organic acid is the important factor in the secondary pore formation.Fault T 4 may be the migration pathway for acidic water, also controlles the distribution of the secondary pore.In vertical,Laumontite dissolution porosity alternately appears from fairly well developed to undeveloped and the thickness of dissolution porosity strata is about 2-3 meters,but feldspar dissolution porosity alternately appears relatively minor and increases with depth. The secondary pore mainly distributes in the first segment of Quantou Formation,the third and forth segments of Denglouku Formation are near the upside of fault T 4. In horizontal the secondary pore is quite well developed in Shengping-Wangjiatun and Changde areas. It is 20%-90% in proportion to the total porosity and in the better reservoir is 3%-7%.The period of the secondary pore formation closely matches that of natural gas migration.Prediction shows that the secondary pore zone may be high-yield hydrocarbon reservoirs.