页岩气储层测井响应特征及识别方法研究

 页岩气是储存在页岩中以游离态和吸附态存在的天然气,正逐渐成为油气勘探的热点。地球物理测井技术具有纵向分辨率高、灵敏和信息量大等优势,在评价页岩气储层方面不可或缺。本文综述了页岩气储层的地质特征、测井响应特征,总结了国内外用测井技术识别页岩和含气页岩层的方法。指出测井组合法和交汇图法能够较好地识别页岩层;气测法、常规测井组合法、ΔlogR法和介电常数法等识别含气页岩层能取得较好效果。

Summary on Logging Response Characteristics and Identification Methods for Shale Gas Reservoir

Shale gas is stored in the shale, and exists in the form of adsorbed and free state. Shale gas is becoming the hot spot of the oil and gas explorations. Geophysical logging technology has high vertical resolution and sensitivity, and is able to provide continuous petrophysical information along the borehole; therefore it is an indispensable means for the reservoir evaluation of shale gas. The geological characteristics and logging response characteristics of shale gas reservoirs are summarized, and identification methods of shale layers and shale reservoirs containing gas by well logging technology at home and abroad are discussed. In recognition of shale layers, the well logging method and cross plot method are introduced. In recognition of shale reservoirs, gas surveying method, conventional well logging combination method, ΔlogR method, and dielectric constant method are presented. According to the research, it is pointed out that combination well logging method and cross plot method could identify shale layers well, and gas surveying method, conventional well logging combination method, ΔlogR method, and dielectric constant method are able to obtain the good performance for identifying containing gas shale reservoirs. Shale gas reservoir logging evaluation research could provide the technical support for Chinese shale gas exploration and development. China should strengthen the research on shale gas reservoir logging evaluation technique and establish the suitable logging evaluation technology for China's deep shale reservoirs, which could reduce the risk of the shale gas exploration and development.