CAJ | 학술논문

通过铸体薄片、扫描电镜、激光共聚焦显微镜、微纳米CT扫描等直观分析手段，对库车坳陷迪北地区致密砂岩气储层中的孔喉微观形态特征开展了系统研究。观测结果显示，该区致密砂岩储层中发育大量的狭长、扁平状孔喉，其中微纳米级的喉道、黏土矿物晶间孔是本区主要的储集空间。同时借助低温氮气吸附测试、恒速压汞试验、覆压条件下储层物性分析等定量研究手段，显示迪北致密砂岩储层中喉道大小分布在1～4μm，喉道体积占总孔隙体积的2／3。综合研究认为储层的渗流能力受喉道大小、孔喉比值影响，直观地反映了孔喉形态对渗流能力的影响；孔喉中黏土矿物对储层的渗流能力起到重要的影响。
통과주체박편、소묘전경、격광공취초현미경、미납미CT소묘등직관분석수단，대고차요함적북지구치밀사암기저층중적공후미관형태특정개전료계통연구。관측결과현시，해구치밀사암저층중발육대량적협장、편평상공후，기중미납미급적후도、점토광물정간공시본구주요적저집공간。동시차조저온담기흡부측시、항속압홍시험、복압조건하저층물성분석등정량연구수단，현시적북치밀사암저층중후도대소분포재1～4μm，후도체적점총공극체적적2／3。종합연구인위저층적삼류능력수후도대소、공후비치영향，직관지반영료공후형태대삼류능력적영향；공후중점토광물대저층적삼류능력기도중요적영향。
The pore?throat characteristics of tight sandstones from Dibei area of the Kuqa Depression were studied using cast thin section, scanning electron microscope, laser scanning confocal microscope and micro/nano CT analyses. A large amount of long, narrow and flat pore?throats were observed. Micro/nano throats and intercrystal pores in clay minerals are the most common in reservoirs. According to nitrogen adsorption, constant velocity mercury injection, and physical property analyses under overburden pressure, the throat radius ranges from 1 to 4 μm, accounting for about 2/3 of the total reservoir space. The fluid flow in tight reservoirs is directly influ?enced by throat radius and pore/throat ratio. Clay minerals in pore?throats control fluid mobility.