碳酸盐岩地层孔隙压力预测方法研究

准确预测地层孔隙压力是防止井壁失稳、实现科学钻井的必要条件。针对碳酸盐岩地层孔隙压力预测相对较难这一问题，从等效深度法计算地层孔隙压力的关键技术入手，重点讨论了在碳酸盐岩剖面中利用视泥岩地层的测井数据构建正常压实趋势线的问题，给出了如何对此正常压实趋势线进行修正并得到研究区域的正常压实趋势线的方法。利用所构建的正常压实趋势方程对川东飞仙关组多口井的碳酸盐岩剖面裂缝-孔隙型储层的地层孔隙压力进行测井预测的结果表明，该方法对于预测碳酸盐岩剖面地层孔隙压力同样具有一定的实用性，而且预测精度较高，效果良好。

Study on predicting method of formation pore pressure for carbonate rock

To predict exactly formation pore pressure is necessary condition for preventing borehole from losing stability and realizing scientific drilling. This paper aims at the relative difficult problem predicting the formation pore pressure of carbonate rock, starts with the key technology of equivalent-depth method to calculate formation pore pressure, and focuses on discussing about setting up the normal compaction trend curve for carbonate rock profile by using apparent logging data of mudstone formation, and then puts forward the method about how to correct the normal compaction trend curve in order to obtain the normal compaction trend curve of studying area. In this paper, the multi-well formation pore pressure of carbonate fracture-pore reservoir of Feixianguan formation on the east of Sichuan was predicted by making full use of the normal compaction trend equation. The result shows that the method also has the certain practicability to predict the formation pore pressure of carbonate rock profile, predicting precision is high, and the effect is better.