断层岩水压张裂漏油主控因素及张性破裂压力预测

In order to prevent faults oil spills under excessive pressure of water injection during oil field exploration,this ariticle would select oil-seal faults in Qinhuangdao 33-1S Oilfield as research target to determine main controlling factors of hydrofracture in fault rock. On the basis of logging and seismic data, shale content within oil-seal fault was forcasted. Through field outcrop observations, shale component within fault rock , whose shale content is similar to that Qinhuangdao 33-1S Oilfield, and distribution features of fractured particles were discribed.Then combining both relative tensile fracture pressure, main controlling factors of hydrofracture in fault rock were determined. With mechanical testing of the systematically selected core samples, its tensile fracture pressure was calculated.The relationship beteween surrounding rock tensile fracture pressure and its diagenetic grade was established. Then surrounding rock diagenetic grade was forcasted with the prediction of diagenetic pressure and diagenetic time. Finally, using the relationship between surrounding rock tensile fracture pressure and its diagenetic grade, fault rock tensile fracture pressure was predicted. The results can provide security and reasonable water injection pressure for oilfield exploration and enrich faults seal oil and gas theory.

为了防止油田开发过程中由于注水压力过大而造成断裂漏油事故，本课题选取秦皇岛33-1S油田封油断裂为研究目标，在利用测井和地震数据预测封油断裂断层岩泥质含量的基础上，通过野外露头重点观察描述与秦皇岛33-1S油田目标封油断裂断层岩泥质含量相似的断层岩内部泥质成分与碎裂颗粒之间的分布特征，结合二者张性破裂压力的相对大小确定断层岩水压张裂主控成分。系统获取与断层岩水压张裂主控成分类似的岩心样品，通过其岩石力学实验计算其张性破裂压力，建立其张性破裂压力与压实成岩程度之间关系。再通过预测断层岩压实成岩所受压力和作用时间，预测断层岩压实成岩程度，最后由围岩张性破裂压力与其压实成岩程度之间关系预测断层岩水压张裂主控成分的张性破裂压力。研究成果可为油田开发提供安全合理的注水压力，同时还可以丰富和完善断裂封闭油气理论研究。

为了防止油田开发过程中由于注水压力过大而造成断裂漏油事故，本课题选取秦皇岛33-1S油田封油断裂为研究目标，在利用测井和地震数据预测封油断裂断层岩泥质含量的基础上，通过野外露头重点观察描述与秦皇岛33-1S油田目标封油断裂断层岩泥质含量相似的断层岩内部泥质成分与碎裂颗粒之间的分布特征，结合二者张性破裂压力的相对大小确定断层岩水压张裂主控成分。系统获取与断层岩水压张裂主控成分类似的岩心样品，通过其岩石力学实验计算其张性破裂压力，建立其张性破裂压力与压实成岩程度之间关系。再通过预测断层岩压实成岩所受压力和作用时间，预测断层岩压实成岩程度，最后由围岩张性破裂压力与其压实成岩程度之间关系预测断层岩水压张裂主控成分的张性破裂压力。研究成果可为油田开发提供安全合理的注水压力，同时还可以丰富和完善断裂封闭油气理论研究。