中国东部中小型断陷盆地陆相页岩气成藏潜力分析——以阜新盆地为例  

Potential of continental shale gas accumulation in medium-and small-sized fault basins in eastern China: A case study from the Fuxin Basin

作　　者：赵群[1,2] 王红岩 杨慎[1] 臧焕荣 刘德勋[1,2] 孙钦平[1] 姜馨淳 Zhao Qun;Wang Hongyan;Yang Shen;Zang Huanrong;Liu Dexun;Sun Qinping;Jiang Xinchun(PetroChina Research Institute of Petroleum Exploration and Development, Langfang, Hebei 065007, China;Na- tional Energy Shale Gas R＆D 〈Experimental〉 Centre, Langfang, Hebei 065007, China)

机构地区：[1]中国石油勘探开发研究院 [2]国家能源页岩气研发(实验)中心

出　　处：《天然气工业》2018年第5期26-33,共8页Natural Gas Industry

基　　金：国家科技重大专项"四川盆地及周缘页岩气形成富集条件;选区评价技术与应用"(编号:2017ZX05035)

摘　　要：中国东部地区发育大量的中生代中小型断陷盆地,盆地内陆相富有机质泥页岩沉积厚度大,白垩纪的火山活动加快了区内页岩中所含有机质的成熟,为页岩气成藏提供了有利的先决条件。为了分析上述断陷盆地陆相页岩气的成藏潜力,以阜新盆地为例,根据最新的钻井资料、岩心和岩屑测试数据,重点分析并评价了该区富有机质页岩厚度、展布、总有机碳含量(TOC)、烃源岩有机质热演化成熟度(Ro)、储集能力和可压性等6项成藏要素,进一步结合页岩储层的特征,研究了该区陆相页岩气的成藏潜力并提出了下一步勘探开发的建议。研究结果表明:?我国东部中小型断陷盆地陆相页岩具有储层总厚度大、TOC高和热成熟度适中等3项页岩气成藏的有利条件,以及页岩储层厚度横向变化大、储集能力偏低和可改造性偏差等3项不利条件;?陆相页岩TOC高(平均值为5.4%),在中生代火山活动的作用下有机质热演化程度较高(Ro>1.2%),位于生气窗内,页岩气成藏具备优越的物质基础;?海相页岩气开发所采用的水平井多段压裂技术在陆相页岩气开发中的效果值得商榷,应积极探索陆相页岩气直井纵向多层立体开发技术;(4)较之于海相页岩气,陆相页岩气单井产量更低,故需要加强断陷盆地陆相页岩气单井经济产能评价工作。结论认为,我国东部断陷盆地多与阜新盆地类似,具备页岩气成藏的物质基础,是陆相页岩气勘探突破的新方向;下一步勘探的重点是找到高储集能力区、落实易改造层段。A great number of Mesozoic medium-and small-sized fault basins are developed in eastern China. In these fault basins, the sedimentary thickness of continental organic-rich shale is great, and the Cretaceous volcanic activities accelerate the maturity of organic matters in the shale, which provide favorable prerequisites for shale gas accumulation. In this paper, the potential of continental shale gas accumulation in the mentioned Mesozoic medium-and small-sized fault basins was analyzed with the Fuxin Basin as an example. Based on the latest drilling, core and cutting test data, six elements of shale gas accumulation in organic-rich shale in the Fuxin Basin were discussed, including thickness, distribution, total organic carbon（TOC） content, thermal evolution maturity of organic matter（Ro）, reservoir capacity and compressibility. Then, depending on the characteristics of shale reservoirs, the potential of continental shale gas accumulation in the study area was investigated, and the suggestions on further exploration and development were proposed. The following results were obtained. First, continental shale in the medium-and small-sized fault basins in eastern China is characterized by great total reservoir thickness, high TOC content and moderate thermal maturity, which are advantageous for shale gas accumulation, while larger lateral thickness variation, lower reservoir capacity and weaker stimulation feasibility, which are disadvantageous for shale gas accumulation. Second, continental shale has high TOC content（averagely 5.4%）, and high Ro（1.2%） under the effect of Mesozoic volcanic activities, suggesting a gas generating window, so there is a superior material basis for shale gas accumulation. Third, it is uncertain whether the multi-stage fracturing technique of horizontal wells for the development of marine shale gas is applicable to the development of continental shale gas, so it is necessary to develop the 3 D vertical multi-layer development technique of vertical wells suitable for cont

关 键 词：中国东部 断陷盆地 阜新盆地 陆相页岩气 成藏潜力 页岩厚度 总有机碳含量 有机质热演化成熟度 直井 多层立体开发 

分 类 号：P618.13[天文地球—矿床学]