Degree of Oil-Gas Charged in Lens-Shaped Sand Body in Jiyang Depression and Its Main Controlling Factors
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摘要: 砂岩透镜体油气藏为岩性油气藏中的一种重要类型, 为济阳坳陷目前和今后油气勘探的主要对象之一.统计结果表明, 济阳坳陷砂岩透镜体油藏的充满度分布在26.8%至94.1%之间, 平均为55%, 其中绝大部分砂岩透镜体油藏的充满度在40%以上, 而大于60%的砂岩透镜体最多.砂岩透镜体油气藏主要分布在沙河街组的沙四段、沙三段和沙二段地层中, 其中沙三段砂岩透镜体油藏充满度最高, 平均达59%;其次为沙二段, 平均为50%;沙四段最小, 平均仅为33%.砂岩透镜体油气藏充满度主控因素的主因子分析结果表明控制砂岩透镜体油气藏充满度最重要的因素为砂岩透镜体的几何特征(砂体厚度和砂体面积)和运移条件(主要为砂岩透镜体内部断层数量、砂岩透镜体与生油洼陷中心的距离以及砂岩透镜体内部的剩余压力), 次重要因素为砂岩透镜体的储集物性(砂岩透镜体的孔隙度和渗透率).Abstract: Lens-shaped sand body oil-gas reservoir is an important kind of lithological oil-gas reservoir. It is widely distributed in Jiyang depression. The statistical data of the degree of oil-gas charged in the lens-shaped sand body (the ratio of the volume of the sand body charged by oil and/or gas to the volume of lens-shaped sand body) in Jiyang depression shows that the degree of oil-gas charged is between 26.8% and 94.1% with an average of 55%. While the degree of oil-gas charged in the overwhelming majority of lens-shaped sand bodies is over 40%, and the degree of most of lens-shaped sand bodies is over 60%. lens-shaped sand body oil-gas reservoir is mainly distributed in the Fourth, the Third and the Second sections of Shahejie Formation. It is found that the degree of oil-gas charged in the Third Section of Shahejie Formation is the highest, averaged at 59%, and the next is in the Second Section with an average of 50%. The degree of oil-gas charged in the Fourth Section is the lowest; its average is only 33%. The primary factor analysis of main controlling factors for the degree of oil-gas charged in the lens-shaped sand bodies suggests that the most important controlling factors are geometry of the lens-shaped sand bodies (thickness and area of the lens-shaped sand body) and the oil-gas migration conditions (the quantity of fault within the lens-shaped sand bodies, the distance between the lens-shaped sand body and source rock and the surplus pressure within the lens-shaped sand bodies). The second important controlling factor is the porosity and permeability of the lens-shaped sand body.
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Key words:
- lens-shaped sand body /
- degree of oil-gas charged /
- Jiyang depression
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表 1 砂岩透镜体油气藏R型第1, 2公因子载荷
Table 1. Loads of the first and second common factors in R primary factor analysis
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