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收集新场构造须二气藏的地质、测井、钻井和压裂等相关资料,尝试运用包括等效深度法、Eaton法、有效应力法在内的多种方法对研究区地层孔隙压力剖面进行了预测。根据前人对川西地区异常高压的产生机制的研究分析,认为川西前陆盆地上三叠统地层异常高压的形成主要受欠压实、生烃增压、黏土矿物脱水增压及构造抬升多种机制影响。最终选用Eaton法建立工区的地层孔隙压力剖面。对地层孔隙压力预测模型进行验证与单井评价,结果表明,模型的预测结果精度较高,能够满足工程要求。根据各单井地层深度划分,新场构造地压梯度情况可大致划分为正常压力带、过渡压力带、高压异常带和压力相对平稳带4个压力区间。该成果对指导后续钻井施工作业和区域地应力场等相关研究具有重要的现实意义。
The new field was constructed to collect the geological, well logging, drilling and fracturing data of the second Xujiahe gas reservoir. Attempts have been made to conduct the pore pressure profile formation in the study area using various methods including equivalent depth method, Eaton method and effective stress method Predicted. According to previous studies on the mechanism of anomalous high pressure in western Sichuan, it is considered that the formation of the anomalous high pressure in the Upper Triassic strata in the western Sichuan foreland basin is mainly caused by undercompaction, hydrocarbon generation and pressurization, dehydration and pressurization of clay minerals, Mechanism impact. The final selection of Eaton method to establish the work area pore pressure profile. The pore pressure prediction model is verified and the single well evaluation results show that the model prediction accuracy is high and can meet the engineering requirements. According to the depth of each single well, the pressure gradient of the new site can be roughly divided into four pressure ranges: normal pressure zone, transitional pressure zone, high pressure anomalous zone and pressure relatively stable zone. The results have important practical significance to guide the follow-up drilling operation and regional stress field research.