CAJ | 학술논문

金家油田沙一段稠油油藏储层黏土矿物主要为钙基蒙脱石，含量高且具膨胀性，导致储层具强水敏性，制约油藏热采开发，因此需要对黏土矿物高温热变特征进行研究，明确其对储层孔隙结构影响方式。高压釜高温物模实验后样品晶间距、溶质分析、X衍射、扫描电镜等资料分析表明：在100℃以上的高温条件下，随温度升高，蒙脱石晶间距减小，膨胀性减弱，对储层孔隙结构的危害不大；蒙脱石及其他成岩矿物高温条件下发生溶蚀、转化形成新的矿物颗粒充填改造大、中孔喉，变成微、小孔喉，导致储层孔隙结构变差。以此，明确了高温条件下影响储层孔隙结构的关键因素是钙基蒙脱石及其它成岩矿物转化形成新的矿物颗粒造成的堵塞而非其膨胀性。
금가유전사일단주유유장저층점토광물주요위개기몽탈석，함량고차구팽창성，도치저층구강수민성，제약유장열채개발，인차수요대점토광물고온열변특정진행연구，명학기대저층공극결구영향방식。고압부고온물모실험후양품정간거、용질분석、X연사、소묘전경등자료분석표명：재100℃이상적고온조건하，수온도승고，몽탈석정간거감소，팽창성감약，대저층공극결구적위해불대；몽탈석급기타성암광물고온조건하발생용식、전화형성신적광물과립충전개조대、중공후，변성미、소공후，도치저층공극결구변차。이차，명학료고온조건하영향저층공극결구적관건인소시개기몽탈석급기타성암광물전화형성신적광물과립조성적도새이비기팽창성。
The high clay content and the expansion of clay mineral consisting mainly of calcium montmorillonite in 1st Member Shahejie Formation in Jinjia Oilfield cause strong water sensitivity,which restrict the thermal recovery, so, the study for thermal alteration of clay mineral is needed to make clear how to effect on the pore structure.The experiments include the crystal axial range of test sample, analysis of aqueous solutes,X-ray diffraction, SEM and oil-bearing thin section after the tests in high temperature in autoclave show that under the condition of high temper-ature above 100 ℃, with temperature rising, montmorillonite crystal spacing is reduced and the dilatability is de-creased, which is little harm to pore structure;the corrosion and conversion to form new mineral grain of montmoril-lonite and other diagenetic minerals under the condition of high temperature filling large and medium pore throat in-to micro-pore throat lead to deterioration of pore structure.Through the understanding, it is clear that the key factors affecting the pore structure of the reservoir is blockage of the new mineral particles transformed by calcium montmo-rillonite and other diagenetic mineral under high temperature condition rather than its expansion.