| 宜昌天阳坪断裂两侧页岩气保存条件对比研究 |
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| 引用本文： | 刘安,陈孝红,李培军,周鹏,李海,蔡全升,罗胜元.宜昌天阳坪断裂两侧页岩气保存条件对比研究[J].地质科技通报,2020,39(2):10-19. |
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| 作者姓名： | 刘安 陈孝红 李培军 周鹏 李海 蔡全升 罗胜元 |
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| 作者单位： | 中国地质调查局武汉地质调查中心 |
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| 基金项目： | 国家科技重大专项2016ZX05034001-002中国地质调查局地质调查项目DD20179615 |
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| 摘 要： | 中扬子宜昌地区在天阳坪断裂两侧实施了数口页岩气调查井和参数井,总体上,断裂两侧页岩的含气性差别较大。从页岩构造变形、裂缝发育特征、古流体活动等方面研究了保存条件差异的原因。结果表明:①因黄陵隆起的砥柱作用,天阳坪断裂以北的宜昌斜坡带为一简单的单斜构造,产状平缓,天阳坪断裂以南属于宜都-鹤峰复背斜的北端,断裂、褶皱构造发育,地层产状变化大;②典型井揭示天阳坪断裂以北地区页岩构造裂缝不发育,天阳坪断裂以南页岩构造裂缝非常发育并见多个破碎带,是页岩气逸散的主要通道;③古流体分析揭示天阳坪断裂以北页岩早期封闭体系的裂缝较发育,晚期裂缝不发育,天阳坪断裂以南地区晚期裂缝发育,古大气水下渗深度超过3500~4000 m,页岩的封闭性破坏严重;④综合研究表明,宜昌周边的页岩气勘探应围绕宜昌斜坡带向东西两侧巴东-大冶对冲干涉带拓展,天阳坪断裂以南的宜都-鹤峰复背斜北端构造变形最强、保存条件差,勘探风险较大。
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| 关 键 词： | 天阳坪断裂 裂缝 页岩气 保存条件 宜昌地区 |
| 收稿时间： | 2019-06-27 |
A comparative study of shale gas preservation conditions on both sides of Tianyangping fault in Yichang area |
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| Liu An,Chen Xiaohong,Li Peijun,Zhou Peng,Li Hai,Cai Quansheng,Luo Shengyuan.A comparative study of shale gas preservation conditions on both sides of Tianyangping fault in Yichang area[J].Bulletin of Geological Science and Technology,2020,39(2):10-19. |
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| Authors: | Liu An Chen Xiaohong Li Peijun Zhou Peng Li Hai Cai Quansheng Luo Shengyuan |
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| Affiliation: | (Wuhan Center of Geological Survey,CGS,Wuhan 430205,China) |
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| Abstract: | The shale gas content is different in different shale gas survey wells and parameter wells, from both sides of Tianyangping fault in Yichang, Middle Yangtze area. The reasons for the difference of preservation conditions are studied from the aspects of shale tectonic deformation, fracture character and paleo-fluid activity. The following results were obtained: ①Because of the pillar effect of Huangling uplift, the Yichang slope is a simple monoclinic structure with gentle occurrence in the north of Tianyangping fault, and on the other hand, faults and folds are well developed and the occurrence of strata varies greatly of northern part of Yidu-Hefeng anticline in the south of Tianyangping fault. ②Typical wells illustrate that fractures and fracture belts of shale are highly developed in the north of Tianyangping fault, and are the channels for shale gas to escape in the north of Tianyangping fault, while fractures are rare in the south of Tianyangping fault. ③Paleo-fluid reveals that more fractures in the early stage of closed system of shale and fewer in the later stage in the north of Tianyangping fault, while more fractures in the later stage lead to the infiltration depth of ancient meteoric water, over 3 500-4 000 m in the south of Tianyangping fault, and the sealing capacity of the shale get worse. ④The conclusion is that exploration should spread to the Badong-Daye ramp interference fringe, in the east and west of Yichang slope; and there are more exploration risks to spread to the south of Tianyangping fault because of the strong tectonic deformation, and worst protection condition in the north end of Yidu-Hefeng anticlinorium. |
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| Keywords: | Tianyangping fault fracture shale gas preservation condition Yichang area |
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