The analysis of differences between fault conduiting and charging for hydrocarbon
Liu Zhen, Zhang Wang, Cao Shang, Liu Mingjie, Zhang Wei, Dong Dong
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249;
2. Luming Oil-Gas Exploration and Development Co., Ltd., Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000
The fault's opening and closing have an influence on the efficiency of hydrocarbon migration and accumulation so it is one of the main factors to control reservoir formation. There is a long neglected question that the hydrocarbon migration and charge in fault is different. It is generally acknowledged that as long as the permeable layer is broken by faults, the layer can be charged by over pressure hydrocarbon. The influence of formation water and hydrocarbon compression property to the charging is rarely witnessed. The paper presented that when single fault activating, under the overpressure, it is hard for deep hydrocarbon to charge the shallow reservoir bed in a form of flashy flow. To a single sand body, a fault acting as the spillway should exist so that the hydrocarbon can successfully charge the sand body through other faults. Therefore, there must be two or more faults, the sand body can be charged. At fault resting stage, hydrocarbon migrates up through the fault surface by the way of seepage that has little influence on the vertical distance the hydrocarbon can reach. This paper discussed the viewpoint by using the relation between typical reservoirs and fault distrubution in four large-scale basins. This view is meaningful to the study of hydrocarbon distribution and the evaluation of hydrocarbon accumulation target.