涪陵平桥页岩气田,五峰组—龙马溪组,“窄陡型”断背斜,保存条件,富集主控因素," /> 涪陵平桥页岩气田,五峰组—龙马溪组,“窄陡型”断背斜,保存条件,富集主控因素,"/>
• 非常规天然气 • 下一篇
郭旭升
Guo Xu-sheng
摘要: 涪陵平桥页岩气田位于四川盆地涪陵凤来复向斜内的“窄陡型”断背斜构造上,目前五峰组—龙马溪组产层探明页岩气地质储量为1 389.17×108m3,揭示该气田具有良好的勘探开发前景。利用现有的钻井、测井、地震及分析化验测试资料,研究了涪陵平桥“窄陡型”断背斜页岩气田的基本特征,分析了页岩气富集高产主控因素和单井产量差异原因。研究表明:①平桥页岩气田气层(TOC≥1%)的累计厚度介于115~155m之间,底部优质页岩层段(TOC≥3%)厚度介于36~40m之间,气田具有储量丰度高(储量丰度为12.68×108m3/km)、气藏压力高(压力系数为1.56)、气井产量高(平均测试产量为21.99×104m3/d)的“三高”特点;②深水陆棚相优质页岩发育、断裂不通天、走滑性质弱、封堵性好且周边无露头等明显泄压区,是页岩气田富集高产的主控因素;③在页岩气层富集条件相似时,微裂缝发育程度、构造位置和埋深是单井产量平面差异的关键因素。
中图分类号:
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