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Characteristics and master control factors of petroliferous properties of low permeability clastic reservoirs of Yan-chang formation in the upper Triassic of Jiyuan area in Ordos Basin
GAO Jian-bo1,PANG Xiong-qi1,2,WANG Zhi-xin1,2,JIANG Zhen-xue1,2,DING Bao-lai1,2,XI Sheng-li3
(1. Key Laboratory for Hydrocarbon Accumulation Mechanism of Education of Ministry f China University of Petroleum,Beijing 102249,China;2. Basin & Reservoir Research Center,China University of Petroleum, Beijing 102249, China;3. Research Institute of Exploration and Development of Chongqing Oilfield , Xi,an 710021, China )
Abstract:
Reservoirs in Yan-chang formation in the upper Triassic in Ordos Basin are low permeability clastic rocks of depression with delta and lacustrine facies. Petrologic characteristics,pore types, physical properties, diagenetic dynamics and pores evolution were researched by observing under microscope, cathode luminescence, scanning electron microprobe, X-ray diffraction ( XRD) and illite K-Ar dating technique. The conclusions are the following:① The reservoir-rock types in Yan-chang formation are mainly arkose, secondly litharenite and lithic arkose in low compositional maturity.②The pore spaces are completely dominated by primary pore, including intergranular pore, intercrystalline pore, dissolved pore and micro-frac-ture,③The diageneses mainly comprise compaction,dissolution, cementation of carbonate and autogenetic clay mineral, the secondary porosity caused by dissolution is unfavorable for the improvement of the physical properties.④The early loss of the porosity results from the fast diagenesis, the deformation of a lot of plastic lithic fragment, strong compaction and the late loss
Key words:  Ordos Basin  Yan-chang formation  clastic rock  low permeability reservoirs  petroliferous properties  master control factors