松辽盆地齐家古龙-三肇凹陷超压对成岩作用的影响 |
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引用本文: | 雷振宇,解习农,孟元林,黄卫,杜学斌,肖丽华,孟凡晋,焦金鹤,刘文慧. 松辽盆地齐家古龙-三肇凹陷超压对成岩作用的影响[J]. 地球科学, 2012, 37(4): 833-842. DOI: 10.3799/dqkx.2012.092 |
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作者姓名: | 雷振宇 解习农 孟元林 黄卫 杜学斌 肖丽华 孟凡晋 焦金鹤 刘文慧 |
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作者单位: | 1.中国地质大学构造与油气资源教育部重点实验室,湖北武汉 430074 |
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基金项目: | 国家自然科学基金40872076中国博士后科学基金第三批特别资助201003654中央高校基本科研业务费专项资金CUGL100252 |
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摘 要: | 松辽盆地齐家古龙-三肇凹陷青山口组以上地层发育3套明显的压力体系,其中作为勘探重点的青山口组和嫩江组泥岩超压不仅控制烃类的生成,还对相邻储层具有深远影响.在前人研究基础上,应用热解分析、X射线衍射、镜下鉴定、扫描电镜、铸体薄片鉴定等资料,研究了超压对地质流体活动及成岩作用的影响.结果表明,超压不仅抑制了粘土矿物转化,还抑制了烃类结构的演化.另外,成岩作用中的压实作用、胶结作用对于超压的抑制有明显的响应.超压并不能直接影响溶解作用,而是通过地质流体间接对其产生影响,主要表现为由次生孔隙产生造成的孔隙度增加.
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关 键 词: | 松辽盆地 超压 流体 成岩作用 地层 |
收稿时间: | 2012-02-28 |
Effecting of Overpressures on Diagensis in the Qijiagulong-Sanzhao Depression of Songliao Basin |
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Abstract: | There are 3 sets of obvious overpressure systems in the strata above the Qingshankou Formation in Qijiagulong-Sanzhao depression, Songliao basin. The overpressure in the Qingshankou (K2qn) and Nenjiang (K2n) Formation mud rock which is the key zone of exploration which not only controls the formation of hydrocarbon, but also impacts the adjacent reservoir property deeply. Based on the previous studies, this paper utilizes abundant materials, including thermal decomposition, X-ray diffraction, microscope analysis, SEM and blue epoxy resin-impregnated thin sections, to study the effect of overpressure on diagenesis. The results indicate: (1) the overpressure constrained the transformation of clay minerals, and also depressed the evolution of hydrocarbon structure. (2) The compaction and cementation during diagenesis responded apparently to the overpressure depression. The overpressure didn't affects dissolution directly, but via the geo-fluids indirectly, causing the increase of porosity by induced pore. |
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