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临清坳陷上古生界油气资源评价
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摘要
临清坳陷位于渤海湾裂谷盆地西南收敛端,在中生代以前属于华北地台的一部分。临清地区具有丰富的煤炭资源,在石炭-二叠系发育的煤系烃源岩有机质丰度高、埋藏深、分布广,一直被认为是煤成烃勘探的有利地区。高古4井的钻探成功,证实了临清地区具有良好的勘探前景。
     临清坳陷上古生界地层保存较好,石炭-二叠系煤系烃源岩有机质丰度高,厚度大,约800-1200m,且埋藏较深,主要分布在洼陷带,保存条件好,为油气形成提供了良好的物质基础。自石炭-二叠系地层沉积后,临清坳陷在发育过程中经历了多期构造运动,不仅使地质构造异常复杂,而且导致该区的煤系烃源岩多期生、排烃和多期运、聚、散。在沉降时,烃源岩的埋深加大,发生烃类的生、排和运聚成藏作用;上升剥蚀时,生、排烃作用停止,已聚集的油气散失,油气藏被破坏。临清坳陷自海西期以来经过了多期构造作用,使早期形成的单一集中的大油气藏被破坏,油气再次运聚成藏,形成多种分散的小型油气藏,导致油气的分布十分复杂。
     本论文在研究了临清地区油气资源评价现状的基础上,遵循临清地区的基本石油地质特征,在叠合单元的基础上,划分出4个较好的评价单元,采用热模拟产烃率法、盆地模拟法和面积丰度类比法三种方法的综合进行油气资源评价,认真客观地选择评价参数进行资源量估算,确定出临清坳陷的资源量为2.782574×108t,最后通过区带评价,提出了高唐-堂邑潜山带、沙镇构造带、德州东部区带、梁村潜山带、铁刘庄构造为首选的有利勘探区块。
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.
引文
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