CAJ | 학술논문

以延长探区上古生界本溪组、盒8段、山23 段作为重点研究层段, 借助微观测试技术和分析化验数据, 对目的层段砂岩储层的储集空间类型、孔喉特征及孔隙演化进行研究, 明确孔隙特征及成因, 探讨储层孔隙与成岩作用的关系. 研究结果表明, 研究区目的层段主要孔隙组合类型为剩余粒间孔+粒间溶孔+颗粒溶孔+高岭石晶间孔. 原生孔隙包括剩余粒间孔和高岭石晶间孔, 次生孔隙包括粒间溶孔和颗粒溶孔, 次生成因的溶蚀孔隙为上古生界主要孔隙类型. 压汞数据显示, 各层段储层毛细管压力曲线总体表现为低排驱压力、分选较好、略细歪度, 本溪组储层孔隙结构相对于盒8段和山23 段较差. 研究区储层成岩作用阶段属于晚成岩B期, 经历的成岩作用中, 压实压溶、胶结作用对孔隙具有较大的破坏性, 而溶蚀作用对储集空间的形成具有建设作用. 晚成岩晚期形成的溶蚀孔隙改善了储层的孔渗条件, 利于油气运聚成藏.
이연장탐구상고생계본계조、 합8단、 산23 단작위중점연구층단, 차조미관측시기술화분석화험수거, 대목적층단사암저층적저집공간류형、 공후특정급공극연화진행연구, 명학공극특정급성인, 탐토저층공극여성암작용적관계. 연구결과표명, 연구구목적층단주요공극조합류형위잉여립간공+립간용공+과립용공+고령석정간공. 원생공극포괄잉여립간공화고령석정간공, 차생공극포괄립간용공화과립용공, 차생성인적용식공극위상고생계주요공극류형. 압홍수거현시, 각층단저층모세관압력곡선총체표현위저배구압력、 분선교호、 략세왜도, 본계조저층공극결구상대우합8단화산23 단교차. 연구구저층성암작용계단속우만성암B기, 경력적성암작용중, 압실압용、 효결작용대공극구유교대적파배성, 이용식작용대저집공간적형성구유건설작용. 만성암만기형성적용식공극개선료저층적공삼조건, 리우유기운취성장.
Benxi Formation, the 8th member of Shihezi Formation and the 3rd submember of the second member of Shanxi Formation are main research targets of Upper Paleozoic in Yanchang Exploration Area. Using microscopic observing and tes-ting techniques and analyzing test data, we probed into the types of reservoir space, pore throat characters and pore evolu-tion, clarified pore features and genesis, and found the relationship between reservoir pore and diagenesis. Research results showed that main pore combinations were composed of residual intergranular pores, intergranular dissolution pores, particle dissolution pores, and kaolinite intercrystal pores. Primary cores consist of residual intergranular pores and kaolinite inter-crystal pores, and secondary pores consist of intergranular dissolution pores and particle dissolution pores. Secondary disso-lution pores are major pore types of Upper Paleozoic. Mercury injection data indicated that the capillary pressure curve of reservoir in each member were characterized by low displacement pressure, better classification, and slightly thinner skew-ness, and pore structure of the reservoir in Benxi Formation was poorer than that of the 8th member of Shihezi Formation and the 3rd submember of the second member of Shanxi Formation. Diagenesis in the study area is at B period of later dia-genesis. Compaction pressolution and cementation damage a lot to pores, but dissolution plays a negative role in reserve space formation. Dissolution pores formed at late period of later diagenesis improved the porosity and permeability of the res-ervoir and was favorable for oil and gas transmission, accumulation and reservoir formation.