四川盆地五峰组—龙马溪组页岩气富集特征与“建造—改造”评价思路

发布时间：2018-04-30 19:12

本文选题：页岩气 + 五峰组　；参考：《天然气地球科学》2017年05期

【摘要】：四川盆地上奥陶统五峰组—下志留统龙马溪组页岩是中国目前页岩气勘探开发的重点层系之一,已发现了涪陵、威远、长宁和昭通等页岩气藏。通过页岩气藏的详细解剖,将五峰组—龙马溪组下部龙一段页岩气富集特征概括为"高、帅、富":"高"主要指页岩层系形成页岩气的原始物质基础条件优越,有机质类型好、丰度高、脆性矿物含量高、热演化程度适中;"帅"主要表现为构造变形较晚、变形强度较弱、变形方式与构造样式有利、抬升幅度以及现今埋深适中;"富"表现为含气量高、地层压力系数大、储层物性好、有利于储层规模改造、初始产量高、最终产出量大,开发难度相对较小,经济效益明显。优越的原始沉积条件与成岩过程(地质建造作用)与后期适度的构造变形改造与抬升剥蚀(地质改造作用)的有机组合,是页岩气的富集高产前提与关键。基于"建造"(生—储演化序列)的评价内容包括层序地层与沉积、生烃和储层孔隙形成3个方面内容,基于"改造"(储—保演化序列)的评价内容主要包括构造变形、储层裂缝形成和页岩气保存2个方面。"建造—改造"的评价思路就是沿着页岩气形成与保存的全过程,既分析页岩气形成的建造条件优劣,又评价构造改造方式、程度的正面、负面影响。基于这种评价思路所建立的各种评价要素的组合模型,更符合页岩气形成与富集规律,也能更有效地消除简单将各种要素不作区别地统一纳入评价体系所带来的偏差。
[Abstract]:The Shale of the Upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation in Sichuan Basin is one of the key strata of shale gas exploration and development in China at present. Shale gas reservoirs such as Fuling, Weiyuan, Changning and Zhaotong have been discovered. Through the detailed anatomy of the shale gas reservoir, the characteristics of shale gas enrichment in the lower part of the Longyi member of the Wufeng and Longmaxi formation are summarized as "high, handsome and rich": "Gao" mainly refers to the superior original material basic conditions and good organic matter types for shale gas formation. High abundance, high content of brittle minerals and moderate thermal evolution, the main features of "Shuai" are late tectonic deformation, weak deformation intensity, favorable deformation mode and structural style, moderate uplift range and present burial depth, and high gas content. The formation pressure coefficient is large, the reservoir physical property is good, is advantageous to the reservoir scale transformation, the initial production is high, the final output is large, the development difficulty is relatively small, the economic benefit is obvious. The organic combination of superior original sedimentary conditions and diagenetic processes (geological formation) and moderate structural deformation and uplift and denudation (geological transformation) is the prerequisite and key to the enrichment and high yield of shale gas. The evaluation content based on "formation" includes sequence stratigraphy and sedimentation, hydrocarbon generation and reservoir pore formation. The evaluation content based on "reconstruction" mainly includes structural deformation. Reservoir fracture formation and shale gas preservation. " The idea of structure-reconstruction evaluation is to analyze the construction conditions of shale gas formation, as well as the positive and negative effects of the degree and degree of structural transformation along the whole process of shale gas formation and preservation. The combination model of various evaluation elements based on this kind of evaluation thought is more consistent with the law of shale gas formation and enrichment and can eliminate the deviation caused by the simple integration of various elements into the evaluation system without distinction.
【作者单位】：页岩油气富集机理与有效开发国家重点实验室;中国石油化工集团公司页岩油气勘探开发重点实验室;中国石油化工股份有限公司石油勘探开发研究院;
【基金】：国家重点基础研究发展计划(“973”)项目(编号:2014CB239100) 国家自然科学基金项目(编号:U1663209;41202103)联合资助
【分类号】：P618.13

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