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川东北地区长兴组和飞仙关组可分别划分为两个Ⅱ型层序:PSQ1,PSQ2,TSQ1和TSQ2。除TSQ2由TST,EHST和LHST组成以外,其他层序均由TST和HST组成。在古断裂的控制下,长兴期至飞仙关期川东北碳酸盐岩台地呈现出独特的台-盆相间以及台地内的滩-洼相间沉积格局。古断裂和相对海平面变化分别通过控制沉积格局和沉积环境的水体能量变化而制约碳酸盐生产率和产出类型,从而影响碳酸盐岩层序充填结构特征。层序充填结构中发育的各成藏要素构成了川东北礁、滩气藏完整的生储盖组合。
Changxing Formation and Feixianguan Formation in northeastern Sichuan can be divided into two Type II sequences: PSQ1, PSQ2, TSQ1 and TSQ2, respectively. Except TSQ2 consists of TST, EHST and LHST, the other sequences consist of TST and HST. Under the control of the ancient faults, the carbonate platforms in northeastern Sichuan from Changxing period to Feixianguan period present a unique platform-basin facies pattern and sedimentary facies pattern in the platform. Paleoproterozoic and relative sea level changes control carbonate productivity and output type respectively by controlling changes of sedimentary pattern and water environment in sedimentary environment, thus affecting the structural characteristics of carbonate sequence filling. The various reservoir-forming elements developed in the sequence filling structure constitute the complete reservoir-cap combination of reef and shoal reservoirs in the northeast Sichuan Basin.