中国西北地区石炭系碎屑岩储集层研究

新疆北部地区石炭系碎屑岩主要为中粒级长石砂粉，岩屑长石砂岩，岩屑砂岩，凝灰质，泥含量高，结构成熟度低，处于晚成岩A期－晚成岩B、C期，局部达近变质阶段，早期方解石胶结发育，原生孔隙保存条件差，但长石，岩屑，早期方解石胶的的化学稳定性较差，古风化壳附近有望找到储集层，在火山岩中可形成裂缝－溶洞型信集层。安西红柳园地区碎屑岩火山岩屑含量较主（8％－17％），热成熟度高，埋藏溶蚀作用不发育，寄希望于次压实型集型层和古风化壳型储集层，祁连地区主要为（纯）石英砂岩，次长石岩屑砂岩，岩屑砂岩，储集空间为粒间（溶）孔，粒内溶也，高岭石晶间微孔及少量裂缝，总体为特低孔， 储集层，部分可达低孔，低渗或中孔，低渗储集层，在最大古埋深较浅，欠压实带以及古风化壳附近的较富含长石和岩屑的砂岩中，有望找到较好的储集层，上石炭统较好储集层主要分布于新疆准噶尔东北部的五彩湾，奇台双井子，准噶尔西部的车排子，百口泉及祁连地区的中卫下河沿，景泰红水堡等地。下石岩较好储集层分布于新疆的双井子和祁连地区的景泰红水堡等地。图1参3（朱如凯摘）。

The study on the clastics reservoir of the Carboniferous in the northwest of China

The coal-bearing rocks during Carboniferous deposited in marine and land transitional environment in Qilian area. The deposits are carbonate and clastics during early Carbonferous, which are subabyssal and abyssal gravity current deposits during late Carboniferous in Liuyuan area. The deposits are terrigenous clastics, marine clastics, carbonate and pyroclastics in the north of Xinjiang area. The clastics during Carboniferous period are medium arkose, lithic arkose, litharenite and feldsparthic litharenite in the north of Xinjiang area; which are quartzarenite, subfeldsparthic litharenite, litharenite and arkose in the Qilian area. The stage of diagenesis is telodiagensis A-B, C, and locally it is at metamorphic stage. There are intergranular pores, intragranular pores, intercrystalline micropores of kaolinite and fractures. The reservoirs are of lower porosity-lower permeability. There are fewer primary pores because of its strong compaction in the north of Xinjiang area. There are better reservoirs where is near the zone of weathering in Qilian area. The better reservoirs of Upper Carboniferous are distributed in Wucaiwan area of northeastern Junggar basin, Shuangjingzi area of Qitai region and Chepaizi and Baikouquan areas in western Junggar basin and Xiaheyan block of Zhongwei area, Hongshuipu block of Jingtai area, and so on of Qilian region. The better reservoirs of the Lower Carboniferous are distributed in the Shuangjingzi area of northern Xinjiang and Hongshuipu area in Qilian region.