Application of Highresolution Sequence Stratigraphy to the Sand Reservoir Prediction for 8th Member of Lower Shihezi Formation in Sulige Gas Field, Ordos Basin
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摘要: 高分辨率层序地层学理论和技术方法目前已广泛应用于陆相隐蔽岩性油气藏的勘探开发中，以此为指导，通过基准面旋回结构、叠加样式的沉积动力学分析，结合地表露头、钻井岩芯、测井资料的综合研究，将苏里格气田苏6井区下石盒子组划分为2个长期、5个中期和14个短期旋回层序，较为详细地讨论了短期、中期和长期旋回层序的结构类型、沉积序列、叠加样式及其与有利储集砂体分布的关系。建立了以长期旋回层序界面和最大洪泛面为等时年代地层框架，以中期旋回层序为等时地层单元的层序地层格架，详细讨论了格架中的不同类型砂体的分布特征。在此基础上对相当短期旋回层序级别的小层单砂体进行劈分和等时追踪对比，采用层序—岩相古地理编图方法，编制中、短期旋回沉积相和砂体分布图，预测有利砂岩储层的横向分布。Abstract: The highresolution sequence stratigraphy theories and technologies are widely used in the exploration and exploitation of subtle lithologic gas reservoir, taking it as a direction ,through dynamic analysis on baselevel cycle structure and stacking pattern , combined with the comprehensive studies of outcrops, cores and well logs,two longterm, five middleterm and fourteen shortterm cyclic sequences from the lower Shihezi Formation of Su 6 well area in Sulige gas field are classified. the structure types, sedimentary cycles, stacking patterns of shortterm, middleterm, longterm cyclic sequences and the relationship between cyclic sequences and distribution of favoring sand are discussed in detail. A chronostratigraghic framework is established by reference to the longterm and middleterm cycle sequences, in which the characteristics of different type of sand are discussed in detail. Based on the division and correlation of individualsandbody correspond to shortterm cyclic sequence,directing by the method of lithofaciespaleogeographical mapping, the sedimentary facies and sand distribution maps of the short or middleterm cyclic sequences come into being , the distribution of favoring sand reservoir can be predicted.
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