美国Marcellus页岩与中国南方龙马溪组页岩地质特征对比及启示
发布时间：2018-09-03 18:55
【摘要】：中国南方地区下志留统龙马溪组富有机质页岩与美国阿巴拉契亚盆地中泥盆统Marcellus页岩,在形成构造背景、沉积环境方面具有一定的相似性,均形成于前陆盆地构造背景下的陆棚-斜坡浅海,沉积环境具有半封闭性。同时,二者也存在一定差异性,Marcellus页岩形成于前陆盆地早期快速沉降阶段斜坡带,其后期经历的构造变形相对较弱;中国南方龙马溪组页岩形成于前陆盆地持续沉降背景下,但其后期经历的构造改造作用多期复杂,其中四川盆地处于距离造山带较远的隆后凹陷构造位置,其除经历了频繁的升降运动外,挤压、拉张改造相对其周缘地区较弱。二者在具体地质特征方面也具有一定差异,主要表现在龙马溪组页岩埋藏较深、有效厚度大、热演化程度相对较高以及有机质含量相对较低。二者形成沉积构造背景以及地质特征的对比研究,对中国南方志留系龙马溪组页岩气进一步的勘探评价以及研究工作具有重要的指导意义。
[Abstract]:The organic shale of the Lower Silurian Longmaxi formation and the Marcellus shale of the Middle Devonian in the Appalachia Basin in southern China are similar in tectonic setting and sedimentary environment. All of them are formed in the Foreland basin tectonic setting, the continental shelf-slope shallow sea, and the sedimentary environment is semi-closed. At the same time, there are some differences between them. Marcellus shale was formed in the slope zone of early rapid subsidence stage of Foreland basin, and its tectonic deformation was relatively weak in the later stage, and the shale of Longmaxi formation in southern China was formed in the context of continuous subsidence of Foreland basin. However, the late stage of tectonic transformation is complicated, and Sichuan basin is located in the structural position of Longhou depression far from the orogenic belt, which, in addition to the frequent ascending and descending movements, compresses and compresses, and the extensional reconstruction is weaker than the surrounding area. There are also some differences in the specific geological characteristics between the two formations, which mainly show that the shale of Longmaxi formation is buried deep, the effective thickness is large, the thermal evolution degree is relatively high, and the content of organic matter is relatively low. The comparative study of the sedimentary tectonic background and geological characteristics between them is of great significance for the further exploration evaluation and research work of shale gas in Silurian Longmaxi formation in southern China.
【作者单位】： 中国地质大学(北京)能源学院;中国石油化工股份有限公司页岩油气富集机理与有效开发国家重点实验室;中国石油化工股份有限公司中国石化页岩油气重点实验室;中国石油化工股份有限公司石油勘探开发研究院;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金项目(41202103) 中国石油化工股份有限公司科技攻关项目(G5800-14-ZS-KJB158;G5800-13-ZSKJB005)
【分类号】：P618.13
[Abstract]:The organic shale of the Lower Silurian Longmaxi formation and the Marcellus shale of the Middle Devonian in the Appalachia Basin in southern China are similar in tectonic setting and sedimentary environment. All of them are formed in the Foreland basin tectonic setting, the continental shelf-slope shallow sea, and the sedimentary environment is semi-closed. At the same time, there are some differences between them. Marcellus shale was formed in the slope zone of early rapid subsidence stage of Foreland basin, and its tectonic deformation was relatively weak in the later stage, and the shale of Longmaxi formation in southern China was formed in the context of continuous subsidence of Foreland basin. However, the late stage of tectonic transformation is complicated, and Sichuan basin is located in the structural position of Longhou depression far from the orogenic belt, which, in addition to the frequent ascending and descending movements, compresses and compresses, and the extensional reconstruction is weaker than the surrounding area. There are also some differences in the specific geological characteristics between the two formations, which mainly show that the shale of Longmaxi formation is buried deep, the effective thickness is large, the thermal evolution degree is relatively high, and the content of organic matter is relatively low. The comparative study of the sedimentary tectonic background and geological characteristics between them is of great significance for the further exploration evaluation and research work of shale gas in Silurian Longmaxi formation in southern China.
【作者单位】： 中国地质大学(北京)能源学院;中国石油化工股份有限公司页岩油气富集机理与有效开发国家重点实验室;中国石油化工股份有限公司中国石化页岩油气重点实验室;中国石油化工股份有限公司石油勘探开发研究院;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金项目(41202103) 中国石油化工股份有限公司科技攻关项目(G5800-14-ZS-KJB158;G5800-13-ZSKJB005)
【分类号】：P618.13
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