【摘要】 阿克亚苏地区三叠系中油组是该区最重要的油气产层,但以往对其砂体类型及展布特征一直认识不清。在中油组砂体发育的层序SQ4内LST4-TST4高精度等时层序地层格架中,根据录、测井资料结合粒度分析手段识别出辫状河三角洲前缘、湖底扇内扇、中扇、外扇及滨浅湖、半深湖—深湖6种亚相,9种微相,揭示了中油组主砂体主要为水下分流河道、补给水道、辫状沟道及滑塌扇砂体。运用地震相分析并结合Stratimagic波形地震相、地震频谱分解、振幅地震属性及波阻抗反演等技术手段,对LST4主砂体展布进行了预测,确定了砂体沉积微相类型及其展布特征;根据波阻抗反演揭示的砂体分布结合LST4主砂体顶面构造特征,优选出Th2井东侧湖底扇中扇断背斜圈闭和Kz2井南部湖底扇中扇辫状沟道岩性圈闭两个有利目标。更多还原

【Abstract】 The Triassic middle oil-member is the most important production pay zone in Akeyasu Area,however its sandbody type and its distribution characteristics have not been clearly understood. In high precision chorostratigraphy framework which was developed in LST4-TST4 of sequence SQ4 in middle oil-member sandbodies,by integrating logging data with grain size analysis 6 subfacies including braided river delta front,sublacustrine inner fan,middle fan,outer fan and shore-shallow lake,semi deep lake-deep lake,and 9 microfacies were recognized,it is revealed that the main types of the middle oil-member major sandbodies are underwater distributary channel,supply water channel,braid canal and slump fan sandbody. By integrating seismic facies analysis with some technical means,such as Stratimagic waveform seismic facies analysis,seismic spectral decomposition,seismic amplitude attribute analysis and impedance inversion,the distribution of LST4 major sandbody was predicted and its sediment microfacies type and distribution were determined,based on sandbody distribution which was revealed by impedance inversion and top structural feature of the LST4 major sandbody,two favorite targets which are sublacustrine fan middle fan faulted anticline trap located in the east of Th2 well and sublacustrine fan middle fan braid canal lithologic trap located in the south of Kz2 well were optimized.更多还原