Evaluation of fault lateral sealing and reservoir accumulation model in Daliuquan Area,Langgu Sag
Hu Xinlei1, Lü Yanfang1, Cao Lanzhu2, Yang Dexiang2, Sun Yonghe1
1. College of Earth Sciences, Northeast Petroleum University, Heilongjiang 163318, China; 2. Exploration and Development Research Institute, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China
Abstract：To understand the oil and gas distribution law in Daliuquan area,Langgu Sag,we first classify the accumulation conditions such as sources,transporting faults,and sedimentary sands.Then we determine fault lateral sealing threshold based on the coupling relation between the minimum shale gouge ratio (SGR) value of certain fault surface and oil testing result in typical wells.Finally taking this threshold as criteria we evaluate fault lateral sealing or opening properties and analyze the accumulation model.The following understandings are obtained based on our research:A.The thickness and buried depth of targets are stable in Daliuquan area,and the faults activity stages are similar so that the effect of compaction diagenesis is not obvious; B.Fault sealing properties are mainly affected by fault rock SGR,and the fault sealing SGR threshold is 29% in the strata Es3x; C.The evaluation results of fault sealing or opening properties are well coincident with the oil and gas distribution,the obtained thickness ratio between mudstone and strata,pressure coefficient,and oil/gas-aqueous interface match well with the estimation,which verifies the feasibility of this proposed approach.For the accumulation model in Daliuquan area,oil and gas were generated from source rocks in strata Es3x and Es4s.The oil and gas migratied vertically along transporting faults,diverted laterally into sands with strata ratio greater than 18% when they encountered overburden sealing.Oil and gas accumulations were formed when sealing faults,anticline traps or unconformity surfaces were encountered.
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Hu Xinlei, Lü Yanfang, Cao Lanzhu, Yang Dexiang, Sun Yonghe. Evaluation of fault lateral sealing and reservoir accumulation model in Daliuquan Area,Langgu Sag. Oil Geophysical Prospecting, 2018, 53(6): 1314-1325.
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