THE STUDY OF FAULT CLOSURE BY USE OF ENTRY PRESSURE AND ITS APPLICATION IN NORTH TARIM
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摘要: 排驱压力是实现油气二次运移所需的最小驱动力,是研究油气二次运移和评价封堵能力的主要指标。断裂的封闭和开启性取决于断裂两侧和断裂带内物质之间差异排驱压力的大小,差值愈大,断裂封闭性愈好,反之愈差。但断裂的封闭性不是一成不变的,一旦油气聚集超过了由差异排驱压力控制的油气柱高度时,断裂将显示开启性;另外,随断裂发育时间和部位的不同,封闭性也不一样。本文着重研究塔里木盆地北部柯坪南缘断裂、印干断裂、库鲁克乌居木等断裂的封闭性问题,并考虑该区压力封闭的下限值及油气流动rc30下限值,研究结果与实际地质调查相吻合。这一研究方法为今后在塔里木盆地北部油区全面开展断裂封闭性研究提供了新的思路,具有重要的理论意义.Abstract: The entry pressure is the minimum driving force which is responsible for oil and gas secondary migration and also major index that measures the secondary migration and the blocking capability of a fault.Opening and closing of a fault depends on the difference of the entry pressure in the fault zone and that in its two sides.This paper puts emphasis on the study of closing of southern Keping fault,Yinggan fault and Kulukejumo fault in the north Tarim basin with reference to the pressure-closed lower limit of mudstone cover and rc30 lower limit of oil-gas migration.The result is consistent with what were observed in the field.
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Key words:
- entry pressure /
- fault closure /
- oil-gas controlling
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