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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.
The paleo-lateral sealing ability during the hydrocarbon accumulation period has an important influence on the accumulation and distribution of oil and gas. There is currently no effective evaluation method for the quantitative analysis of the paleo-lateral sealing of the fault. During the prediction of oil column height by the SGR (Shale Gouge Ratio) lower limit method, it was found that there was a partial mismatch between the ability of lateral confining of oil and gas and the distribution of oil and gas in the fault, that is, the well was within the predicted range, but the oil- It is concluded that this phenomenon may be due to the weak ability of the paleo-lateral sealing (less than the lower limit of lateral confined oil and gas) during the hydrocarbon accumulation period. Therefore, based on the SGR lower bound method of lateral sealing of faults, A set of evaluation methods for the paleo-lateral sealing of the fault has been established based on the thickness of the paleo-formation, the paleo-fault interval and the argillaceous sediment content during the hydrocarbon accumulation period. Taking the Wen 13 depression in the Wenlin slope in the Jizhong depression as an example, The paleo-lateral seal assessment method is used to quantitatively evaluate the paleo-lateral sealing ability of the broken ring. The results show that the height of laterally closed oil and gas in Wen 13 fault ring during oil and gas accumulation is 0m, , Which shows that this method is feasible to quantitatively evaluate the paleo-lateral sealing of the fault. It is of practical and theoretical significance to accurately evaluate the ability of oil and gas to seal off in a circle, reduce the risk of oil and gas drilling in a fault zone, and enrich and perfect the lateral sealing theory of faults.