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利用岩性、电性等资料识别出了绥靖地区长4+5湖泛泥岩,建立了其识别标志,并研究了其平面展布特征。在此基础上,运用测井技术研究了长4+5湖泛泥岩的厚度、含砂量和总孔隙度3个地层参数,对每个参数赋予权值,综合评价了长4+5湖泛泥岩封盖性级别,将其划分为11个权级数和4个盖层级别,同时,评价了研究区内6个泥岩区带的长4+5湖泛泥岩的盖层级别。最后,分析了长4+5湖泛泥岩对长6油藏和长2油藏补偿成藏的控制作用:①长4+5湖泛泥岩封盖性权级数在10~5之间时,为优—良盖层,其作为长6盖层封堵油气,形成长6岩性油藏;②长4+5湖泛泥岩封盖性权级数在4~-1之间时,为差—非盖层,在较大排驱压力的作用下,油气穿透长4+5湖泛泥岩层,运移至长2圈闭内形成构造—岩性油藏。
Based on the lithology and electrical properties, the Pan-4 + 5 lacustrine mudstone in the appeasement area was identified and its distinguishing mark was established and its plane distribution characteristics were studied. On the basis of this, using logging technology to study the thickness, sand content and total porosity of the 3 + 5 lacustrine mudstone in the Chang 4 + 5 strata, the weight of each parameter is given. The mudstone seal level is divided into eleven power levels and four caprock levels. At the same time, the caprock level of the Chang 4 + 5 lacustrine mudstone in the six mudstone zones in the study area is evaluated. Finally, the controlling effects of the Chang 4 + 5 lacustrine mudstone on the compensation reservoir formation of the Chang 6 and Chang 2 reservoirs were analyzed: ① When the caving power of Chang 4 + 5 lacustrine mudstone is between 10 and 5, As a good - favorable cap layer, as a cover of the Chang 6 capstone oil and gas, the formation of Chang 6 lithologic reservoirs; ② Chang 4 +5 lacustrine mudstone capping power levels between 4 ~ -1, the difference - Non-caprock, under the action of larger displacement pressure, oil and gas penetrate the 4 + 5 lacustrine mudstone and migrate into the 2nd traps to form structural-lithologic reservoirs.