Abstract:Recently,studies of the controlling influence of tectonics on deposition become one of the hot topics pursued in the international geological and hydrocarbon exploration research area. However,researches of tectonic controlling on the reservoir are relatively scarce. Based on the analyses of tectonics,sedimentology and reservoir in the Chezhen Sag,the depositional filling and reservoir development characteristics of different structural styles were discussed. Firstly,structural styles have important influence on the depositional filling types and characteristics. In the area where plane faults were developed,only the nearshore subaqueous fans and a few sliding turbidite fans were deposited. The sublacustirne fans were widely developed at the toe part of the listric faults,while some nearshore subaqueous fans were developed in the vicinity of the toe part of the boundary fault. In the area where slope-flat style faults and faulted ladder were developed and controlled by the secondary faults,onshore and subaqueous deposits were usually developed together with facies such as alluvial fan,fan delta,nearshore subaqueous fan and sublacustrine fan. Secondly,the structural styles play an important role in influencing the vertical accumulation pattern,the scale and architecture of sandstone conglomerates which leads to the final control on the reservoir quality. Integrated studies show that the areas with the development of slope-flat style and faulted ladder style faults host various sedimentary facies and are the most favorable areas for reservoir development. The areas with the development of the listric style faults host thinly bedded sandstone conglomerate of sublacustrine fan facies and are the secondary favorable ones. The areas with the development of the plane style faults host a narrow sandstone conglomerate distribution belt and a thick individual layers which contain the poorest quality of reservoir. The study provides the prediction for high quality reservoir developing areas within the lowly to moderately explored rifted basins.
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