Research On Oil Enrichment Regularity Of Chang6Formation In Yong852Well Area Of Hechuan, Zhidan

Yong852wells filed is located in the middle of Shanbei slope of Ordos Basin.With the deepening of Yanchang formation explore, show a good explorationprospects. At present, the main oil-bearing horizon in the study area Chang6formation recognition is not clear about regularity of reservoir′s petroleumaccumulation and the main control factors of distribution.On the basis of collecting and summarizing previous researches, bycomprehensive application of theories of sedimentology, reservoir geology，andlogging geology，based on regional geological background of the Paleozoic of OrdosBasin, focusing on Chang6formation of Hechuan Yong852well field of the OrdosBasin. This article comprehensively analysises the Chang6formation, thesedimentary system, and reservoir characteristics. On this basis, puts forwardthe factors of controlling Chang6oil and gas enrichment.The study of Chang6oil and gas enrichment regularity show that: hydrocarbonsource rocks thickness is thick in the local area, stable distribution, and highmaturity, completely meet the conditions of hydrocarbon generation. If want toLook for oil and gas enrichment region, that is starting looking for reservestratum of high quality and effective caprock. This paper argues that in the oiland gas accumulation conditions are to be met: First of all, to have a large stabledistribution of the sedimentary sand body, as the material basis. Second,reservoir property has a larger effect on oil and gas enrichment, the enrichmentof oil and gas focuses on sand body thicker and good regional properties in general.Finally, the effective caprock sealing oil and gas, ensures that oil and gasenrichment.