摘要
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.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第6期1-9,共9页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家重点基础研究发展计划(2013CB228003)
关键词
页岩气
水平井
井眼轨迹
前导地质物理模型
随钻测井
shale gas
horizontal well
well hole trajectory
preliminary geological and physical model
LWD
