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本文根据钻井测压数据、泥岩等效深度法,从成藏及构造等特征分析了川西地区须家河组异常高压分布现象。该区超压分布具有明显的分区性,异常高压与天然气的生成、运移、聚集和成藏有着密切的联系。超压机制有燕山期的烃源岩生气作用和喜马拉雅期的构造挤压作用,而喜马拉雅期的构造挤压作用是造成川西地区普遍超压的主要原因。通过对本区致密砂岩气藏的解剖,认为超高压力区分布是小储量气藏,而常压—高压区是大—中型储量气藏富集区。
According to the data of drilling manometry and the equivalent depth method of mudstone, this paper analyzes the distribution of anomalous high pressure in Xujiahe Formation of western Sichuan based on the characteristics of hydrocarbon accumulation and tectonics. The overpressure distribution in this area is obviously zoning. The abnormal high pressure is closely related to the formation, migration, accumulation and accumulation of natural gas. The overpressure mechanism has the source rocks of the Yanshanian period and tectonic extrusion in the Himalayan period. The tectonic extrusion in the Himalayan period is the main cause of the overpressure over the western Sichuan. Through the dissection of the tight sandstone gas reservoirs in this area, it is considered that the distribution of ultra-high pressure area is a small reserve gas reservoir while the atmospheric pressure-high pressure area is a large-medium-sized reservoir gas accumulation area.