CAJ | 학술논문

运用压汞、扫描电镜和低温氮吸附技术，研究鄂尔多斯盆地长7段致密油储层微观孔隙结构特征，获得储层毛细管压力曲线和低温氮吸附曲线，进而得到储层喉道类型、不同类型孔隙分布、孔隙特征与物性的相关关系等。研究结果表明：研究区储层孔隙度平均值为7．94％，克氏渗透率均值为0．033 mD，属于低孔、致密储层；研究区储层的毛管压力曲线从形态差异分为三类，Ⅰ类曲线储层宏孔最为发育，占全部空隙的80％，喉道以微细喉类型为主，微喉控制孔隙的退汞量占总退汞量13％；Ⅱ类曲线储层孔隙发育较差，喉道以细喉发育为主，微喉控制孔隙的退汞量占总退汞量25％；Ⅲ类曲线储层介孔最为发育，约占全部空隙的50％，喉道类型较为复杂，细喉、微细喉道和微喉均有发育，微喉控制孔隙的退汞量占总退汞量的46％；储层渗透性与储层比表面和孔喉比等特征参数呈负相关，且该储层微裂缝发育较差。
운용압홍、소묘전경화저온담흡부기술，연구악이다사분지장7단치밀유저층미관공극결구특정，획득저층모세관압력곡선화저온담흡부곡선，진이득도저층후도류형、불동류형공극분포、공극특정여물성적상관관계등。연구결과표명：연구구저층공극도평균치위7．94％，극씨삼투솔균치위0．033 mD，속우저공、치밀저층；연구구저층적모관압력곡선종형태차이분위삼류，Ⅰ류곡선저층굉공최위발육，점전부공극적80％，후도이미세후류형위주，미후공제공극적퇴홍량점총퇴홍량13％；Ⅱ류곡선저층공극발육교차，후도이세후발육위주，미후공제공극적퇴홍량점총퇴홍량25％；Ⅲ류곡선저층개공최위발육，약점전부공극적50％，후도류형교위복잡，세후、미세후도화미후균유발육，미후공제공극적퇴홍량점총퇴홍량적46％；저층삼투성여저층비표면화공후비등특정삼수정부상관，차해저층미렬봉발육교차。
The throat type, different type pore size distribution , pore characteristics and poroperm characteris-tics correlation are studied in order to investigate the microscopic pore structure of tight oil in Erdos basin .A series of experimental methods , including mercury intrusion , scanning electron microscopic and low-temperature nitrogen absorption , are applied to obtain the mercury capillary-pressure curve and low-temperature nitrogen adsorption iso-thermal curves .The results show that:this reservoir porosity mean value is 7.94%, the klinkenberg permeability mean 0.033 mD, belongs to the low porosity , low permeability reservoir;Basically , capillary pressure curve can be classified into 3 classes according to the morphological differences , reservoir macro-pore whichⅠcurve reflects de-veloped most , according for the total gap 80%, most of the pore throat diameter less than 0.2 μm.In all mercury ejection volume, ejection volume of less than 0.2 micron throat control gap account for 13%;reservoir pore volume which II curve reflects the smallest , most of the pore throat diameter is 0.2~0.5μm, In all mercury ejection vol-ume, ejection volume of less than 0.2 micron throat control gap account for 25%;reservoir mesoporous which III curve reflects developed most , accounting for all air gap around 50%, The throat type is complex , the pore throat diameter is 0.007~0.42 μm.In all mercury ejection volume , ejection volume of less than 0.2 micron throat con-trol gap account for 46%;reservoir permeability was negatively correlated with the reservoir characteristic parame-ters such as the pore throat ratio and surface , and the micro fracture is poor .