辽中北部东营组地层压力预测及超压成因分析  

Formation-pressure Prediction and Over pressure Origin of Dongying Formation,Northern Liaozhong Sag

作　　者：张震[1] 杨朋[1] 步少峰[1] 敬乐[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.成都理工大学,四川成都610059

出　　处：《天然气技术与经济》2013年第5期14-19,77,共6页Natural Gas Technology and Economy

基　　金：国家科技重大专项"渤海海域已证实的富生烃凹陷再评价及新领域勘探方向"(2008ZX05023-001-004)资助

摘　　要：准确预测现今异常地层压力，并探索与把握异常压力的成因及其发育特征具有重要的理论意义与实践价值。以声波时差资料为基础，结合其他测井、地质、地化及测试资料，利用平衡深度法、Bowers法、Eaton法计算辽中凹陷北部JZ21-1及JZ16-4构造古近系东营组的地层压力，并综合分析地层压力的分布特征，该构造带超压起始于东营组二段下部，最大的超压发育在东三段，压力系数分布范围为1.20~1.74。利用速度-垂直有效应力交汇图法确定了研究区形成异常高压的主要原因为泥页岩不均衡压实作用，次要原因为流体传导作用。To not only predict abnormal formation pressure but also master its origin and development feature are very significant. Based on some data of interval transit time, well-logging, geology, geochemistry, and formation test, the formation pressure is calculated for Paleogene Dongying Formation in both JZ21-1 and JZ16-4 structures, northern Liaozhong sag, by adopting balance depth, Bowers and Eaton methods. In addition, the distribution features of formation pressure are analyzed. Results show that for this structural belt(,1)the overpressure originates from lower Dongying 2 Member whereas the maximum overpressure just develops at Dongying 3 Member;(2)the pressure coefficients range from 1.20 to 1.74; and(3)after adopting velocity-vertical effective pressure crossplot, the primary reason to form abnormally high pressure is mud-shale unbalance compaction whereas the secondary one is fluid conduction.

关 键 词：地层压力 超压成因机制 不均衡压实 流体传导 东营组 辽中凹陷北部 

分 类 号：P618.13[天文地球—矿床学]