CAJ | 학술논문

环江地区长7储层底部广泛发育张家滩高阻泥岩，为中生界优质烃源岩，源储接触关系明显，砂体含油饱和度高，是勘探开发的重要储层。以岩心观察的岩石相标志及测井相分析为基础，通过地层砂地比、单井相剖面的相序分析，对鄂尔多斯盆地环江地区长7储层沉积相类型及发育规律进行综合研究。结果表明：环江地区长7期主要沉积体系属于河流三角洲相和湖泊相沉积体系，发育三角洲前缘亚相和浊积扇亚相，主要沉积微相类型包括有水下分流河道、水下天然堤、分流间湾、浊积水道、浊积水道前缘、浊积水道间。根据沉积微相展布和演化规律可以得出研究区的沉积模式。
배강지구장7저층저부엄범발육장가탄고조니암，위중생계우질경원암，원저접촉관계명현，사체함유포화도고，시감탐개발적중요저층。이암심관찰적암석상표지급측정상분석위기출，통과지층사지비、단정상부면적상서분석，대악이다사분지배강지구장7저층침적상류형급발육규률진행종합연구。결과표명：배강지구장7기주요침적체계속우하류삼각주상화호박상침적체계，발육삼각주전연아상화탁적선아상，주요침적미상류형포괄유수하분류하도、수하천연제、분류간만、탁적수도、탁적수도전연、탁적수도간。근거침적미상전포화연화규률가이득출연구구적침적모식。
High resistance mudstone and dark mudstone which developing at the bottom of the Chang7 reservoir are high-quality source rocks of Mesozoic in Huanjiang oilfield. The contacted relationship of source reservoirs is obvious, the sandstone oil is saturation and is an important exploration and development reservoir. Based on the sign of rock phases and log facies a-nalysis logging, a comprehensive study of the type of Chang7 sedimentary facies in Huanjiang by means of the distribution law of the ratio of sand-stratum, the phase sequence analysis of the single well profile, ect. . It turns out that the main deposi-tional system of Chang 7 reservoir in Huanjiang area belongs to Shallow Lakes-Delta deposition system, with the development of delta front facies and turbidite fan facies and the main microfacies types include underwater distributary channels, underwa-ter natural levee, shunt bay, turbidite channels, the leading edge of the turbidite channels. According to the spread of sedi-mentary microfacies and evolution rule of the sedimentary microfacies, depositional model of the study area can be received.