| The study area is located in the middle of North Shanxi slope, Ordos Basin. In the region, after years of exploration and development of the Chang 6, Chang 4+5, Chang 2 oil layer and Yan'an Formation production, the oil production plummeted, lack of available reserves development blocks and formation have affected the production construction work of the whole area. However, the Chang 3 oil layer of Triassic is low degree of exploration and development, the reservoir geological characteristics is also a lack of in-depth comprehensive research and clear understanding. According to the regional geological background of the basin and evolution characteristics,Chang 3 oil layer in the delta front subfacies depositional systems, which is conducive to the growth of oil and gas reservoirs. And the well of partial area has gained industrial commercial oil flow after oil test. Therefore, through the in-depth study of Chang 3 reservoir geological characteristics, find out the oil and gas enrichment regularity and control factors, afford geologic basis for exploration and development of Chang 3 reservoir.In this paper, according to a large number of well drilling, logging, testing analysis and well testing and early production test, based on the comprehensive research on reservoir geological characteristics, specific research Chang 3 development characteristics and controlling factors of the reservoir in the study region.The result shows that Chang 3 oil layers are typical of structural-lithological reservoir, which controlled and influenced by sedimentary facies belt, reservoir physical property and Nose-like uplift structure. Underwater distributary channel and the subject of mouth bar microfacies develop the reservoir sandstone; reservoir physical property control the oil and gas distribution reflected in the thickness of a reservoir is related to physical properties; High nose-like uplift structure affect the distribution of oil and gas. High structural site is well oil-bearing. |
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