Research On The Reservoir Characteristic And Hydrocarbon Enrichment In Chang6of Triassic In Kangtai District, Nanniwan Oilfield, Ordos Basin

In order to provide the scientific prediction of the geology on expanding exploration and forecasting oil favourable object, it is necessary to research meticulously relationship between the reservoir characteristic and the oil enrichment of Kangtai region in Nanniwan oilfield. In this paper, using the related theory of petroleum geology as a guide, reservoir characteristic of sedimentary micro facies, petrology, diagenesis, physical property and heterogeneity of Chang6reservoir in Kangtai region are studied, and classificated and evaluated, then the relations between reservoir and the oil-gas was conclued, which concentrated with distribution of oil deposit, in accordance with studying the macroscopic and microcosmic, and the use of logging, well logging, laboratory analysis and test.Chang6reservoirs mainly construct by sand body in underwater distributary channel of Chang62and in distributary channel of Chang61in Kangtai region. The oil and gas accumulate mainly in channel of sand body with good physical property. The correlation between thickness and the effective thickness of sandstone are positive. The distribution of oil and gas are changed in the heterogeneity of porosity and permeability. Oil accumulated in more advantage area of high porosity and high permeability. The reservoir physical property is improved by corrosion, but the poor physical property reservoir is caused by the carbonate cement which prevent oil migration. The oil flow regionally with thickness of source rock which changes small and low hydrocarbon intensity. The effective rock association of source-reservoir-cap are provided by vertical relations of Chang7, Chang6, Chang4+5for hydrocarbon accumulation.