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依据岩心、录井和测井等资料,以高分辨率层序地层学理论为指导,对吉木萨尔凹陷A区芦草沟组各级次基准面旋回演化规律及高分辨层序地层模式进行研究。研究表明,芦草沟组发育1个长期基准面旋回、6个中期基准面旋回、44个短期基准面旋回。探讨了咸化湖相各短期旋回的层序结构、叠加样式及空间变化;建立了A区芦草沟组高分辨层序地层对比格架。通过对基准面旋回期间体积分配和相分异的分析,得出了短期基准面旋回形成优质致密油储层的沉积相类型及控制因素;认为致密油储层段恰好位于2个升降旋回的转换面处,为半深湖-浅湖亚相的碳酸盐岩、席状粉砂岩等细粒沉积,因此2个旋回的基准面下降半旋回控制着上下致密储层的发育;微相类型控制着致密储层的位置与质量。该认知对于指导A区甚至咸化湖相高精度地层对比具有重要意义。
Guided by high-resolution sequence stratigraphy theory, based on the data of core, logging and well logging, the evolution of sub-base level cycles and the high-resolution sequence stratigraphy model of Lucaogou Formation in area A of Jimusar Sag the study. The study shows that Lucaogou Formation developed a long-term reference cycle, 6 mid-term cycle and 44 short-term cycle. The sequence structure, superimposition pattern and spatial variation of each short-term cycles of the salty lacustrine facies are discussed. A contrasting frame of the Lucaogou Formation in the area A is established. Through the analysis of volume distribution and phase differentiation during the cycle of reference plane, the types of sedimentary facies and control factors for the formation of high-quality tight oil reservoirs by short-term base-level cycles are obtained. It is considered that the tight oil reservoir section is located just after the conversion of two ascending and descending cycles Surface, for the semi-deep lake - shallow lake subfacies of carbonate rocks, silt sandstone and other fine sediments, so the two gyratory reference plane down half-cycle control of the upper and lower tight reservoir development; micro-phase type control The location and quality of tight reservoirs. The cognition is of great significance for guiding the stratigraphic comparisons of the high salinity lacustrine sediments in A zone.