苏里格气田盒8段高分辨率层序结构特征

通过钻井岩芯观察,结合测井资料和地震解释成果,按基准面旋回原理,把鄂尔多斯盆地石盒子组第8段划分为一个超长旋回层序、两个长期、四个中期和若干短期基准面旋回层序,并深入分析了形成中期、短期层序结构类型(A,C型)的背景、层序结构特征及其与储集砂体的展布关系.研究表明:不同的层序结构类型的形成受控于沉积背景、构造活动等所决定的可容纳空间和A/S值的变化.为进一步研究盒8段乃至整个石盒子组高分辨率层序地层学特征奠定了基础.

Characteristics of high-resolution sequence structure for Member 8 of Shihezi Formation in Sulige gas field of Ordos Basin

Based on the comprehensive research of rock cores, well loggings and seismic data and according to the principles of base-level cycle, one super-long-term, two long-term, four middle-term and several short-term cycles sequence are distinguished in Member 8 of Shihezi Formation in the Sulige gas field of Ordos Basin. The sedimentary environment, tectonic setting, sequence staking patterns (Type A and C) in the long-term and short-term base-level cycles are discussed. Then, the characteristics of sequences structure and the relationships between that and the distribution of resevoir sand body are also studied in the paper. All the resaerch results show that every change from ratio of accomodation space to sedimentary supply (A/S) which controlled by sedimentary setting and tectonic aotivity leads to each type of sequence structure. And the conclusion gives the basis of a further study on the high-resolution sequence (stratigraphy) for the all and the one in the Shihezi Formation.