Linqing Depression Evaluation Of Upper Paleozoic Oil And Gas Resources

Linqing Depression, which belonged to the part of North China Platform in the Mesozoic before, is located in southwest convergence side of the Bohai Bay rift valley basin. Linqing region with abundant coal resources, whose coal hydrocarbon source rocks in Carboniferous–Permian have high abundance of organic matter, buried deep, wide distribution and so on, has been regarded as the most favorable areas in coal-derived hydrocarbon exploration. Drilling success the gaogu 4 well, which confirmed that linqing region has good exploration prospects.Upper Paleozoic of the Linqing Depression preserved well, Carboniferous-Permian source rocks, with high abundance of organic matter, large thickness, about 800-1200m, and buried deep, which mainly distributed in sub-sag belt, and preservation condition is good, so we can say that Carboniferous-Permian source rocks provides good material base for oil and gas formation. Since the Carboniferous-Permian strata deposited, Linqing depression has experienced multi-stage structural movements during the development, which results in extremely complex geological structure, and leads to source rocks undergo multi-stage generation and expulsion hydrocarbon, and multi-stage migration, gathered and loss. In the settlement, source rocks with the increased depth, commenced the role of generation, expulsion and migration and accumulation; in the erosion, generation and expulsion hydrocarbon stoped, the gathered oil and gas lost, oil and gas reservoirs had been destroyed. Linqing depression has gone though torsional pressure, tension, folding deformation, erosion, and so on, which caused breaking of the early formation of a single centralized large oil and gas reservoirs, so oil and gas went through migration and accumulation again, formed a variety of small reservoirs, which led to the very complex of distribution of oil and gas.This thesis, based on the studing the status of Linqing region oil and gas resources evaluation, according to the special geologic characteristics of the Linqing area, choose integrated resource evaluation, which synthesizes hydrocarbon production rate of thermal simulation method, basin simulation and analogy method, and chooses carefully and objectively evaluation parameters, estimates resources. Finally, the thesis ascertains that the resources of Linqing depression are about 2.782574×108t, then, carrys out the evaluation zone, proposes the favorable exploration blocks: Gaotang-Tangyi hill zone, Shazhen belt, Dezhou eastern zone, Liangcun hill zone, Tieliuzhuang belt.