昭通国家级示范区龙马溪组页岩气储层超压成因浅析

发布时间：2018-07-12 20:43

本文选题：昭通国家级示范区 + 页岩储层超压　；参考：《天然气地球科学》2016年03期

【摘要】：与北美页岩气区块页岩储层相比,昭通国家级页岩气示范区下志留统龙马溪组页岩表现埋藏深、成熟度高、孔渗低、地层压力系数高的特点。以页岩气钻井、测井资料解释及试井、试气数据为依据,着重对龙马溪组页岩气储层超压的分布规律和形成机制进行分析,以探索储层超压与页岩气高产的关系。研究表明,页岩储层超压与保存条件关系密切,随储层埋深与向斜宽度的增大、离通天断层与剥蚀区的距离增加,储层压力系数增大;而有机质生烃、剥蚀卸载、地应力挤压以及致密封隔层,是页岩储层超压形成的主要原因。分析认为,页岩储层超压是页岩气高产的重要因素,反映出处于有机质过成熟演化阶段的昭通示范区页岩储层,天然微裂缝发育,游离气所占比例较高。总体认为,昭通示范区龙马溪组页岩储层具有典型超压特征,是页岩气开发的甜点区,同时加强页岩储层超压预测研究有利于指导页岩气勘探。
[Abstract]:Compared with the shale reservoirs in North American shale gas blocks, the shale of Lower Silurian Longmaxi formation in Zhaotong National Shale Gas demonstration area is characterized by deep burial, high maturity, low porosity and permeability, and high formation pressure coefficient. Based on shale gas drilling, logging data interpretation, well testing and gas test data, the distribution and formation mechanism of overpressure in shale gas reservoir of Longmaxi formation are analyzed in order to explore the relationship between reservoir overpressure and shale gas production. The study shows that the overpressure of shale reservoir is closely related to the preservation conditions. With the increase of reservoir depth and syncline width, the distance from Tongtian fault to denudation area increases, and the pressure coefficient of reservoir increases, while organic matter generates hydrocarbon, denudates and unloads, and the reservoir pressure coefficient increases with the increase of reservoir depth and syncline width. In-situ stress extrusion and sealing barrier are the main reasons for the formation of shale reservoir overpressure. The analysis shows that the overpressure of shale reservoir is an important factor for the high production of shale gas, which reflects that the natural micro-fracture is developed and the proportion of free gas is high in Zhaotong demonstration area where organic matter is over mature and evolved. It is considered that the shale reservoir of Longmaxi formation in Zhaotong demonstration area is characterized by typical overpressure and is a dessert area for shale gas development, and it is beneficial to guide shale gas exploration by strengthening the prediction of overpressure in shale reservoir.
【作者单位】：中国石油天然气股份有限公司浙江油田分公司;
【基金】：中国石油天然气集团公司重大专项“页岩气钻采工程现场试验”(编号:2012F-47-02) 国家科技重大专项“云南昭通页岩气开采试验”(编号:2012ZX05018-006)联合资助
【分类号】：P618.13

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