Study Of Hydrocarbon Migration And The Rules Of Petroleum Accumulation In Wuerxun Sag, Hailaer Basin

This paper mainly studies hydrocarbon migration paths and accumulation rule of the Wuerxun sag in Hailaer basin. In this paper, the research on the hydrocarbon migration conducting channel is mainly through three aspects to achieve :reservoir sandbody, unconformity and fault (fracture).(1)We made full use of drilling and well logging and seismic analysis and test data on hand of research area, further studied oil and gas migration research theories and principles and steps of all kinds of methods, we make the analysis of features of hydrocarbon migration channels, including reservoir pore channels, unconformity passageway, finally after single factor, multi-factor analysis of porosity, permeability, lithologic character, sand ground ratio, relations between porosity and capillary radius, interlayer heterogeneity , quantitative research and evaluation research of heterogeneity we studied features and distribution of pore channels in reservoir sandbody. (2) Through comparing characteristics of the main fault and the influence of the fault on the oil and gas distribution we studied tectonic characteristics and distribution of channels.(3) This paper identifies unconformity structures through the lithologic association with three-layer structure, characteristics of petrophysical property and seismic profiles. Through the statistics on planar distribution of thickness of cross section with unconformity structure we studied the rule of planar distribution of unconformable structure.In this paper, the research on the distance and direction of the hydrocarbon migration is mainly fulfilled by oil property and the differences of concentration and component between nitrogen. In the final analysis on the operation rules of typical gas reservoir, we extracted the parameters needed by basin simulation, such as various geological relationship between lithology and porosity, the ancient and modern geothermal gradient in thermal history, the thickness of hydrocarbon source rocks in the hydrocarbon-generating history. According to the experiential formula and the common model of migration and accumulation, through the calculation with secondary migration module, we got the direction and characteristics of the fluid secondary migration in geologic period. Results show that the reservoir found nowadays in the sub-sag in the north of Wuerxun sag is mainly nearly source of hydrocarbon accumulation, and the reservoir forms accumulation in northeast along the faults after long distance migration. The reservoir remains undiscovered in slope zone. The reservoir nowadays found accumulates in slope zone in the sub-sag in the south of Wuerxun sag. Because of the block of faults, the reservoir fails to continue to migrate to the east.