| 黔西比德-三塘盆地煤储层异常高压形成机制 |
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| 引用本文： | 吴财芳,王 聪,姜 玮.黔西比德-三塘盆地煤储层异常高压形成机制[J].地球科学,2014,39(1):73-78. |
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| 作者姓名： | 吴财芳 王 聪 姜 玮 |
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| 作者单位： | 1.中国矿业大学资源与地球科学学院, 江苏徐州 221116 |
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| 基金项目： | 国家自然科学基金项目41272178国家科技重大专项项目2011ZX05034国家重点基础研究发展计划"973"项目2009CB219605 |
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| 摘 要： | 比德-三塘盆地含煤地层的储层压力普遍较高, 压力梯度较大, 异常高压发育.通过研究该盆地现今煤储层压力分布特点, 对煤层异常高压影响因素进行了综合分析, 阐明了其形成机制.结果表明: 构造作用是本区异常高压形成的最主要因素, 煤储层生烃作用和顶板泥岩的封闭性次之.盆地内部断裂较少, 具有良好的圈闭条件, 储层流体富集, 压力增大, 易出现超压地层.研究区煤层生烃能力强, 含气量高, 但渗透率普遍较低, 生成的烃类气体使得储层内部流体孔隙体积膨胀产生高压.同时, 超厚的顶板泥岩封闭性较好, 在沉积过程中极易产生欠压实作用, 进一步促进了异常高压的形成.
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| 关 键 词： | 比德-三塘盆地 异常高压 煤储层 储层压力 构造 油气 |
| 收稿时间： | 2013-02-26 |
Abnormal High-Pressure Formation Mechanism in Coal Reservoir of Bide-Santang Basin,Western Guizhou Province |
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| Abstract: | The coal reservoir has high reservoir pressure, great pressure gradient and developmental abnormal high pressure in Bide-Santang basin. This paper mainly analyzes the influence factors of abnormal high pressure and illustrates the formation mechanism by studying the distribution characteristics of coal reservoir pressure. Results show that the tectonism is the uppermost factor to the abnormal high pressure formation, hydrocarbon generation of coal reservoir and roof mudstone sealing take second place. There are few faults, good sealed conditions and rich reservoir fluid in the interior of basin, which led to the increase of coal reservoir pressure and abnormal high pressure. The coal reservoir has strong hydrocarbon generation ability, high gas content and low permeability, and generated hydrocarbon gas makes the internal fluid pore volume of coal reservoir expanded and produce high pressure. Moreover, the extra-thick roof mudstone which easily causes undercompacted compaction in the deposition process has good sealing, and further promotes the development of the abnormal pressure. |
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