Due to the characteristics in deep buried depth, poor physical properties of reservoir and difficulty in the effective reservoir prediction, the exploration of mid-deep oil and gas in mid-deep reservoirs is constrained mainly by reservoir quality. In QHD36-3 oil field, the storage properties are significantly superior to those of clastic reservoir at the same depth, including bioclastic dolostone and terrigenous clastic dolostone discovered in the second member of Shahejie Formation, and it will be one of the new fields in the mid-deep oil and gas exploration. This study suggests that the formation of dolomite reservoir is mainly affected by paleogeomorphology, paleao-water depth, and development degree, which is affected by the distance from the source area. The bioclastic dolostone formed by chemical and biochemical depositions is distributed in shallow to deep lake areas, and the reserving spaces include interlayer fractures and solution channels. Under the guidance of the sedimentary principle, the paper proposes a mixed sedimentation model of bioclastic dolostone in the second member of Shahejie Formation in Bozhong depression and further discusses the controlling factors of the mixed sedimentation. The establishment of the corresponding deposition pattern is essential for the oil and gas exploration related with bioclastic dolostone and terrigenous clastic dolostone.
Discovery of Bioclastic Dolostone in the Second Member of Shahejie Formation in Bozhong Depression and Its Significance in Oil Exploration[J]. Science & Technology Review, 2010, 28(08): 60-64
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