桂中坳陷西北部桂页1井泥盆系页岩气聚集条件研究

发布时间：2018-02-13 04:44

本文关键词： 桂中坳陷泥盆系页岩页岩气储集条件　出处：《中国石油勘探》2017年04期 　论文类型：期刊论文

【摘要】：桂中坳陷西北部普遍发育的泥盆系页岩,是滇黔桂地区页岩气勘探突破的重点。为查明该地区页岩气聚集条件及资源潜力,以桂中坳陷首口单井完整钻遇泥盆系各套主力页岩层的桂页1井岩心资料为研究对象,通过均匀取样(采样间隔2m),对300余块岩心样品进行有机地球化学、岩石矿物学等实验分析,认为桂中坳陷西北部泥盆系页岩具有厚度大(470~1300m)、有机碳含量高(0.23%~10.63%)、热演化程度高(R_o为1.88%~2.83%)等特点,有利于页岩气的生成和聚集;另外,其脆性矿物含量高、有机质孔及微裂缝发育等特点显示出页岩层段良好的可改造性。然而,经过多期构造运动改造,断裂活动对该区的页岩储层有一定破坏作用,对页岩的含气性有较大影响。从勘探潜力来看,通过分析泥盆系3套主力页岩层(榴江组、罗富组、纳标组)的各项参数指标,认为榴江组下段从有机地球化学特征、物性特征、成藏条件等方面均相对有利,是该区页岩气勘探的重点层段。
[Abstract]:Devonian shale, which is widely developed in the northwest of central Guangxi depression, is the key point of shale gas exploration breakthrough in Yunnan, Guizhou and Guangxi. In order to find out the accumulation condition and resource potential of shale gas in this area, Based on the core data of Gui Ye 1 well in the main shale formations of the Devonian system in the first single well in the central Guangxi depression, organic geochemistry of more than 300 core samples was carried out by uniform sampling (sampling interval of 2 m ~ (-1)). The petromineralogical analysis shows that the Devonian shale in the northwestern part of the central Guangxi depression is characterized by a thickness of 4701 300 mg, a high organic carbon content of 0.23% and 10.63%, and a high thermal evolution degree (Ro = 1.88 and 2.83%), which is conducive to the generation and accumulation of shale gas, in addition, its brittle mineral content is high. The development of organic pore and microfracture shows that the shale formation is good to be remade. However, through the multi-stage tectonic movement transformation, the fault activity has a certain destructive effect on the shale reservoir in this area. According to the exploration potential, by analyzing the parameters of the three main shale formations of the Devonian system (Yujiang formation, Luofu formation, Nanbiao formation), it is concluded that the lower member of the Yujiang formation is characterized by organic geochemistry. The physical characteristics, reservoir forming conditions and so on are relatively favorable, which is the key section of shale gas exploration in this area.
【作者单位】：中国地质调查局油气资源调查中心;中国地质科学院地质力学研究所;中国石油化工股份有限公司勘探分公司;
【基金】：中国地质调查局项目“滇黔桂上古生界页岩气战略选区调查”(DD20160196)
【分类号】：P618.13

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