Turbidite Feature And The Significance Of Petroleum Exploration Of Chang6In Southwest Fuxian County Of The Ordos Basin

By comprehensive application of theories of sedimentology, petroleum geology, tectonic geology,reservoir geology,and production data, geologic control,logging geology, dynamic analys, this article researches turbidite feature of Chang6formationof Southwest Fuxian County of the ordos Basin:analyzes deposition face symbol of Chang6formation, classifys deposition micro-facies, researches its exhibition law; exposes the features of Chang6reservoir with main controlling factors, explores relationship of turbidite and hydrocarbon accumulation of Chang6formation.The analysis of facies symbol indicate that Chang6has typical turbidity sedimentary characteristics. The main deposition sequence is incomplete Bouma sequence, as well as BCD^ABC.It belongs to the delta front slump turbidite rocks,and has a constraint channel.The unity chang6formation develops middle fan subfacies, the main deposits are the microfacies of Turbidity waterway and between turbidity waterway and middle fan transition belt,the main micro facie is Turbidity waterway. Sand body of chang6is controlled by sedimentary facies.These data from various kinds of analysis and test material, such as casting body chip, cathodeluminescence and scanning electron microscope indicate that reservoir lithology mainly for fine-grained feldspar sandstone,the main pore type is intergranular pore. Macro irregularity and microinhomogeneity of reservoir are strong. The main factors of influencing physical property of reservoir are depositional environment and diagenesis.In addition, Extensive development of cracks provides good passageway for migration.The comprehensive analysis indicates that the good physical property of turbidite sandstone is profitable location for oil accumulation. At the same time, the region of interest, next-door neighbour to lake basin heart,has good group of the birth, reservoir and cover. In the microfacies of turbidity waterway, thicky sand body and good physical property of turbidite sandstone possess exploration foreground, It has a guiding significance for next exploration and development and deployment of Fuxian County.