CAJ | 학술논문

苏里格气田苏77区块中二叠统石盒子组盒8下亚段沉积时期辫状河道发育，储层岩性以岩屑石英砂岩、岩屑砂岩为主。储层经历了压实、压溶、自生矿物胶结以及后期溶蚀作用，大部分已进入中成岩B期，达到低孔-特低渗储层级别。根据主要的成岩矿物、填隙物、成岩作用及孔隙组合，将盒8下亚段储层按照储集性能的优劣划分为石英加大溶孔相（Ⅰ）、黏土矿物充填晶间孔相（Ⅱ）、碳酸盐矿物胶结相（Ⅲ）和压实压溶致密相（Ⅳ）4类成岩相带。其中Ⅰ类成岩相为有利储集相，Ⅱ类成岩相储集性能次之，Ⅲ、Ⅳ类成岩相属于较差储集岩相。根据不同成岩相的测井响应特征可以识别出成岩相的同心、侧变和互层三类组合模式。
소리격기전소77구괴중이첩통석합자조합8하아단침적시기변상하도발육，저층암성이암설석영사암、암설사암위주。저층경력료압실、압용、자생광물효결이급후기용식작용，대부분이진입중성암B기，체도저공-특저삼저층급별。근거주요적성암광물、전극물、성암작용급공극조합，장합8하아단저층안조저집성능적우렬화분위석영가대용공상（Ⅰ）、점토광물충전정간공상（Ⅱ）、탄산염광물효결상（Ⅲ）화압실압용치밀상（Ⅳ）4류성암상대。기중Ⅰ류성암상위유리저집상，Ⅱ류성암상저집성능차지，Ⅲ、Ⅳ류성암상속우교차저집암상。근거불동성암상적측정향응특정가이식별출성암상적동심、측변화호층삼류조합모식。
Braided channels developed well in the lower part of the 8th member of middle Permian Shihezi For-mation in Su77 block of Sulige Gas Field. Lithic quartz sandstone and lithic sandstone are the main lithology of reservoir. After compaction, pressure solution, authigenic mineral cementation and later dissolution, most of re-servoirs that are low porosity and ultra-low permeability ones have entered middle diagenetic stage B. According to the main diagenetic minerals, fillings, diagenesis and pore combination, reservoirs of the lower part of the 8th member of middle Permian Shihezi Formation are divided into 4 diagenetic facies as followed: Ⅰ. quartz over-growth and dissolved pore facies;Ⅱ. clay minerals filling and intergranular pore facies; Ⅲ. carbonate minerals cementation facies;Ⅳ. compaction and pressure dissolution dense facies. Facies Ⅰ are the best reservoirs and faciesⅡare second-best ones. FaciesⅢandⅣare poor reservoirs. According to logging facies, diagenetic faci-es are combined as concentric pattern, lateral variation pattern and cross-layer pattern.