CAJ | 학술논문

利用岩石薄片、扫描电镜、阴极发光等技术方法，结合储层物性、沉积相等资料，对川西坳陷孝泉-新场地区须家河组四段储层发育的控制因素和储层预测地质模型进行了研究。结果表明，该区须四段储层岩石类型主要为岩屑砂岩、岩屑石英砂岩、钙屑砂岩等富含岩屑的砂岩，砂岩成分成熟度高，结构成熟中等；主要的储集空间为粒间溶孔、粒内溶孔和铸模孔，储层类型主要为孔隙型和裂缝-孔隙型，储层物性差，为典型的致密砂岩储层；压实作用和胶结作用是砂岩致密化的主要因素，而溶蚀作用和破裂作用是相对优质储层发育的关键；控制须四段相对优质储层形成的主要因素为沉积微相、埋藏早期和溶蚀期砂体所处的古构造位置以及（主要是下亚段）裂缝发育情况。据此建立了该区须四段储层预测地质模型：须四上亚段储层预测地质模型为三角洲前缘分流河道、河口坝微相＋埋藏早期古构造高位置；须四段下亚段储层预测地质模型为砂岩含量高的辫状分流河道、河口坝微相＋溶蚀期古构造高位置＋裂缝发育区。
이용암석박편、소묘전경、음겁발광등기술방법，결합저층물성、침적상등자료，대천서요함효천-신장지구수가하조사단저층발육적공제인소화저층예측지질모형진행료연구。결과표명，해구수사단저층암석류형주요위암설사암、암설석영사암、개설사암등부함암설적사암，사암성분성숙도고，결구성숙중등；주요적저집공간위립간용공、립내용공화주모공，저층류형주요위공극형화렬봉-공극형，저층물성차，위전형적치밀사암저층；압실작용화효결작용시사암치밀화적주요인소，이용식작용화파렬작용시상대우질저층발육적관건；공제수사단상대우질저층형성적주요인소위침적미상、매장조기화용식기사체소처적고구조위치이급（주요시하아단）렬봉발육정황。거차건립료해구수사단저층예측지질모형：수사상아단저층예측지질모형위삼각주전연분류하도、하구패미상＋매장조기고구조고위치；수사단하아단저층예측지질모형위사암함량고적변상분류하도、하구패미상＋용식기고구조고위치＋렬봉발육구。
A study is carried out on the controlling factors and geological prediction models in the 4th member of the Xujia-he Formation in Xiaoquan-Xinchang area ,western Sichuan Basin .Technical methods or tools such as thin section observa-tion,SEM and cathodoluminescence spectroscope had been employed and data like reservoir physical parameters ,sedi-mentary facies and so on had been utilized .The results show that the reservoirs in the formation are mainly sandstones with high lithic content , such as lithiarenite , sublitharenite and calcarenaceous sandstone .These sandstones have high compositional maturity and medium textural maturity .Reservoir space is mainly intergranular dissolved pore ,intragranular dissolved pore and moldic pore .The reservoir are mainly of porous type and fractured-porous type with poor reservoir quality,and are typical tight sandstone reservoirs .Compaction and cementation caused densification of the sandstone while dissolution and fracturing played key roles in the formation of reservoirs with relatively good quality .Factor as depo-sitional microfacies ,the position of sandstone in the Paleostructures during early burial process and dissolution period ,and fracture growth ( mainly at the lower section ) are considered to control the formation of reservoirs with relatively good quality in the 4th member of the Xujiahe Formation .Hence,two geological prediction models are established for the upper and lower section of the 4th member respectively:they are delta front distributary channel microfacies and/or mouth bar microfacies plus paleostructural high during early burial process , sandy braided distributary channel microfacies and /or mouth bar microfacies plus paleostructural high during dissolution period plus fracture zone .