南海高温高压领域基于传递模式的它源压力预测方法研究  

Study on prediction method of allochthonous pressure based on transfer mode in high temperature and high pressure field of South China Sea

作　　者：刘爱群 范彩伟 吴云鹏 李芳 LIU Aiqun;FAN Caiwei;WU Yunpeng;LI Fang(CNOOC China Limited,Zhanjiang Branch,Zhanjiang,Guangdong 524057,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《中国海上油气》2021年第1期50-55,共6页China Offshore Oil and Gas

基　　金：“十三五”国家科技重大专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术(三期)(编号:2016ZX05024-005)”;中海油南海西部油田上产2000万方关键技术研究“南海西部高温高压气藏勘探开发技术及勘探新领域研究(编号:CNOOC-KJ 135 ZDXM 38 ZJ 02 ZJ)”部分研究成果。

摘　　要：南海莺-琼盆地中深层目标普遍具有高温高压特征,前些年研究认为异常高压形成的主因是泥岩欠压实,但随着勘探领域的扩大,2014年以来单纯按照泥岩欠压实模式钻前预测压力与实测地层压力出现了较大的误差。通过近两年钻遇的高温高压井随钻及钻后压力分析认为:除传统的泥岩欠压实自源异常压力成因外,还存在基于传递(砂体传递、断裂系统传递和耦合传递)模式的它源异常压力成因,该认识是高温高压领域压力成因认识的重大突破。本文通过典型实例认识到存在基于传递模式的它源异常压力,将传递模式分类并解释相应的成因,总结了基于传递模式的它源压力预测方法及适用范围,并成功应用于高温高压新钻井的钻前压力预测。本文研究为高温高压领域大型气田的发现提供了技术保障,并为合理的井身结构设计和提高钻井安全提供了技术支持,具有广阔的推广应用前景。The middle and deep targets in the Ying-Qiong basin of the South China Sea are characterized by high temperature and high pressure.In previous years,it was considered that the main cause of abnormal high pressure was mudstone under-compaction.However,with the expansion of exploration field,since 2014,there has been a large error between the pre-drilling predicted pressure and the measured formation pressure only according to the mudstone under-compaction mode.Based on the analysis of pressure while drilling and after drilling of HTHP wells in recent two years,it is considered that in addition to traditional genesis of autochthonous abnormal pressure of mudstone under-compaction,there is also a genesis of allochthonous abnormal pressure based on the transfer(sand body transfer,fault system transfer and coupling transfer)mode,which is a major breakthrough in the understanding of pressure genesis in high temperature and high pressure field.In this paper,through typical examples,it is recognized that there is an allochthonous abnormal pressure based on transfer mode.The transfer mode is classified and the corresponding causes are explained.The prediction method and application scope of allochthonous pressure based on transfer mode are summarized,and the method is successfully applied in pre-drilling pressure prediction of new HTHP wells.It provides technical supports for the discovery of large gas fields in high temperature and high pressure field,the reasonable well structure design and the drilling safety,which has broad application prospects.

关 键 词：莺-琼盆地 高温高压领域 泥岩欠压实 传递模式 砂体传递 断裂系统传递 耦合传递 

分 类 号：TE132.14[石油与天然气工程—油气勘探]