页岩气水平井前导地质物理模型的测井研究

A Well Logging Study for Preliminary Geological and Physical Shale Gas Horizontal Well Modeling

夏宏泉 王瀚玮 赵昊

XIAHongquan WANGHanwei ZHAOHao

"油气藏地质及开发工程"国家重点实验室·西南石油大学, 四川 成都 610500 四川长宁天然气开发有限责任公司, 四川 成都 610000

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China Sichuan Changning Gas Development Co. Ltd., Chengdu, Sichuan 610000

以川南威远地区寒武系筇竹寺组页岩气为研究对象，首先，利用邻井的测井储层评价结果优选“地质甜点”作为导向目标层；其次，分析沿井眼轨迹方位钻遇不同岩性、物性、含油性及脆性的地层剖面的随钻测井响应特征，并根据LWD和MWD资料实时确定地层倾角和厚度，准确建立前导地质物理模型；最后，利用井眼轨迹-随钻测井曲线-气藏岩性剖面综合成图技术及时判断水平井井眼轨迹在页岩储层中的位置、延伸长度及上下行方向，实时优化井眼轨迹与修正前导地质物理模型，指导钻头在优质页岩储层中的钻进，提高钻遇率。将该方法应用于研究区的页岩气水平井地质导向钻井中，效果明显。

The subject of this study was shale gas of the Cambrian Qiongzhusi Group located in the Weiyuan County of southern Sichuan. First, the reservoir evaluation results from adjacent logging wells were used to select the "geological sweet spot" as the geosteering target layer; next, we analyzed the LWD (Logging while drilling) response characteristics, such as varying lithology, physical properties, lubricity, and brittleness, of stratigraphic cross sections encountered along the well hole trajectory. Based on the LWD and MWD (Measuring while drilling) data, we determined the stratum's dip angle and thickness in real time and accurately established a preliminary geological and physical model. Finally, using well hole trajectory-LWD curve-reservoir lithology cross-section integrated mapping technology, we promptly identified the location, extension length, and incline/decline direction of the horizontal well hole trajectory within the shale reservoir and optimized the well hole trajectory in real time and revised the preliminary geological and physical model to guide the drilling bit to a high-quality shale reservoir, thus improving the reservoir encounter rate. Applying this method to geologically guided drilling of horizontal shale gas wells within the study area led to significant results.

10.11885/j.issn.1674-5086.2016.07.15.03