塔中石炭系碎屑岩成岩作用与孔隙演化

DIAGENESIS AND PORE EVOLUTION OF CARBONIFEROUS CLASTIC ROCKS IN CENTRAL TARIM

翟永红 刘生国 郭建华 肖传桃 罗传容

Zhai Yonghong Liu Shengguo Guo Jianhua Xiao Chuantao Luo Chuanrong

塔中石炭系碎屑岩(CⅠ和CⅢ油组)以粘土矿物转化:溶蚀发育,压实、石英次生加大微弱,早期碳酸盐胶结缺乏,晚期碳酸盐局部充填为特征,原生孔隙得以最大限度的保存,约在15%左右。塔中各并石炭系处于晚成岩阶段,A、A期正是有机酸生成的高峰,溶蚀作用强烈,使原生孔隙锦上添花,孔隙度增至20%～23%,形成高孔高渗优质储层。

Carboniferous elastic rocks in Central Tarim Basin are characterized by clay mineraltransformation, well-developed dissolution, weak compaction and quartz secondary enlargement, lacking of carbonate cementation in early stage and local carbonate filling in late stage.Primary porosity was preserved to the maximum value of about 15%. The Carboniferoussequences drilled in Central Tarim are now in the late diagenetic stage (containing A and A stages). This stage is considered to be the peak period of organic acid production, and dissolution is intensive. This could considerably improve the primary porosity (increasing to 20%-23% ), thus forming high porosity and high permeability reservoirs.

10.11743/ogg19950309