油气成藏期断层古侧向封闭性预测方法及其应用

发布时间：2018-08-30 15:25

【摘要】：油气成藏期断层古侧向封闭能力的强弱对于油气的聚集和分布有着重要的影响,目前尚无有效的评价方法用于定量分析断层古侧向封闭性,并且在利用断层侧向封闭油气SGR(Shale Gouge Ratio)下限方法预测油柱高度过程中,发现断层侧向封闭油气能力与油气分布呈现部分不吻合现象,即井在预测范围之内,但是该井却不含油气.经过深入研究表明:这种现象可能是由于在油气成藏期断层古侧向封闭能力弱(达不到侧向封闭油气下限)造成的.因此,在断层侧向封闭油气SGR下限方法的基础上,通过恢复油气成藏期的古地层厚度、断层古断距、古泥质含量曲线,建立一套断层古侧向封闭性的评价方法,并以冀中坳陷文安斜坡文13断圈为例,利用断层古侧向封闭性评价法对断圈的古侧向封闭能力进行定量评价.结果表明:文13断圈在油气成藏期侧向封闭油气高度为0m,与井试油结论相吻合,表明该方法用于定量评价断层古侧向封闭性是可行的,对于准确评价断圈封闭油气能力、降低断圈油气钻探风险以及丰富和完善断层侧向封闭理论均具有实践和理论意义.
[Abstract]:The paleo-lateral sealing ability of faults in hydrocarbon accumulation stage has an important influence on the accumulation and distribution of oil and gas. There is no effective evaluation method for quantitative analysis of fault paleo-lateral sealing at present. In the process of predicting the oil column height by using the SGR (Shale Gouge Ratio) lower bound method of fault lateral seal oil and gas, it is found that the fault lateral seal oil and gas ability and oil and gas distribution are partially inconsistent, that is, the well is within the prediction range, but the well does not contain oil and gas. The results show that this phenomenon may be due to the weak paleo-lateral sealing ability of faults during the hydrocarbon accumulation period (which can not reach the lower limit of lateral seal oil and gas). Therefore, on the basis of the SGR lower limit method for lateral sealing of oil and gas, a set of evaluation methods for the paleo-lateral sealing of faults are established by restoring the paleostratigraphic thickness, the ancient fault spacing and the paleo-mud content curve of the oil and gas accumulation period. Taking the Wen 13 fault circle of Wenan slope in Jizhong depression as an example, the paleo-lateral sealing ability of fault is quantitatively evaluated by the method of fault paleo-lateral closure. The results show that the oil and gas height of lateral seal of fault circle in Wen13 oil and gas reservoir formation period is 0 m, which coincides with the conclusion of well test, which indicates that this method is feasible to quantitatively evaluate the paleo-lateral sealing property of fault, and is useful for evaluating the sealing ability of fault circle accurately. It is of practical and theoretical significance to reduce the risk of oil and gas drilling in fault zone and to enrich and perfect the theory of fault lateral sealing.
【作者单位】：东北石油大学地球科学学院;
【基金】：国家自然科学基金项目(Nos.41372154,41602154,41572127) 中国石油科技创新基金项目(No.2015D-5006-0103) 国家科技重大专项(Nos.2016ZX05007003-003,2016ZX05006-005)
【分类号】：P618.13

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