CAJ | 학술논문

依据野外露头、岩芯、测井及相关测试资料，对鄂尔多斯盆地苏里格南部地区上古生界中二叠统石盒子组盒8沉积期的沉积类型、沉积微相特征及沉积相对天然气成藏富集的影响进行了分析。结果表明：鄂尔多斯盆地苏里格南部地区盒8沉积期自北向南依次发育缓坡浅水辫状河三角洲和滨浅湖沉积相，亚相主要为三角洲平原、三角洲前缘、滨湖和浅湖，微相包括分流河道、分流间洼地、水下分流河道、水下天然堤、分流间湾、滨湖砂坝、滨湖泥湾和浅湖泥湾；各微相在空间上相互叠置，复合加积；各微相水动力条件的差异造成微相在沉积物成分和组构上各异，导致其成岩作用不同；分流河道和水下分流河道微相发育处密集形成相互叠置的大面积骨架砂体，构成区内主砂带，成为天然气优质储集层，是有利勘探相带；沉积相明显控制优质储集层的分布，进而影响着天然气的富集成藏。总之，水下分流河道和分流河道微相是砂岩优质储集层分布和发育的最有利相带，也是今后勘探开发的方向。
의거야외로두、암심、측정급상관측시자료，대악이다사분지소리격남부지구상고생계중이첩통석합자조합8침적기적침적류형、침적미상특정급침적상대천연기성장부집적영향진행료분석。결과표명：악이다사분지소리격남부지구합8침적기자북향남의차발육완파천수변상하삼각주화빈천호침적상，아상주요위삼각주평원、삼각주전연、빈호화천호，미상포괄분류하도、분류간와지、수하분류하도、수하천연제、분류간만、빈호사패、빈호니만화천호니만；각미상재공간상상호첩치，복합가적；각미상수동력조건적차이조성미상재침적물성분화조구상각이，도치기성암작용불동；분류하도화수하분류하도미상발육처밀집형성상호첩치적대면적골가사체，구성구내주사대，성위천연기우질저집층，시유리감탐상대；침적상명현공제우질저집층적분포，진이영향착천연기적부집성장。총지，수하분류하도화분류하도미상시사암우질저집층분포화발육적최유리상대，야시금후감탐개발적방향。
Based on the outcrop observation, core description and logging analysis, the sedimentary types,characteristics of sedimentary microfacies and the effect of sedimentary facies on gas-forming accumulation in member 8 of Shihezi Formation of Upper Paleozoic in the southern Sulige area of Ordos Basin are analyzed.The results show that the shallow slope blanket braided river delta and shore-shallow lake sedimentary facies develop from north to south in He-8 depositional stage in the southern Sulige area of Ordos Basin,the subfacies include delta plain, delta front,shore and shallow lake,and the microfacies include distributary channel,inter-channel depression,underwater distributary channel,subaqueous levee,inter-channel bay,shore bar,shore mud bay and shallow lake mud bay;microfacies overlap each other in space and accumulate compositely;the difference of hydrodynamic conditions for the microfacies causes the dissimilarity of sediment component and fabric,and different diageneses;a large of skeletal sandbodies overlapped develop in distributary channel and underwater distributary channel,and are the main sand belt and high quality reservoir for gas;sedimentary facies controls the distribution of high quality reservoir for gas significantly, and influences the gas-forming accumulation.In general,distributary channel and underwater distributary channel are most favorable for the distribution and development of sandstone high quality reservoir, and are important for future exploration and development.