和田河气田奥陶系底水气藏水侵机理研究  

A STUDY ON WATER INVASION MECHANISM OF THE BOTTOM-WATER GAS RESERVOIR IN THE ORDOVICIAN SYSTEM OF HETIAN-HE GAS FIELD

作　　者：程开河[1] 江同文[1] 王新裕[2] 牟伟军[1] 潘昭才[1] 施英[3] 王华[3] 

机构地区：[1]西南石油大学研究生院 [2]中国石油塔里木油田公司柯克亚作业区 [3]塔里木油田公司

出　　处：《天然气工业》2007年第3期108-110,共3页Natural Gas Industry

基　　金：塔里木油田公司自研项目<和田河气田开发方案设计>的资助。

摘　　要：塔里木盆地和田河气田奥陶系底水气藏为裂缝性碳酸盐岩气藏,地质研究表明,该气藏水侵的主要方式为水锥型。为了分析该气藏底水上升规律,给开发方案设计提供科学依据,决定利用单井剖面模型对水锥机理进行研究。在分析其主要地质特征的基础上建立了单井剖面模型,采用数值模拟技术研究不同水体大小、不同有效厚度、不同射开厚度、不同非渗透层、不同地层渗透率、不同生产压差以及水平井技术对底水锥进的影响。结果发现,水体大小等因素都对底水锥进产生不同程度的影响,水平井则可以把“底水锥进”演变为“底水推进”。通过机理研究基本搞清了气藏底水运动规律,得出了防止和控制底水上升的措施。据此,建议气藏开发时采用水平井技术,气井部署在储层有效厚度大、平面渗透率较高、垂向渗透率较低的区域,射孔时应有一定的避射厚度,生产时要注意控制生产压差。The Ordovician bottom-water reservoir in Hetian-he gas field of the Tarim Basin belongs to fractured carbonate gas reservoir. According to the study results, the primary type of water invasion in this reservoir is water-coning. To analyze the advancing mechanism of the bottom water as scientific basis for the design of the development plan, a single-well profile model was applied to figure out water-coning mechanism of this reservoir. This model was built based on the dominating geologic characteristics, and meanwhile, the influential factors on bottom-water coning, such as different aquifer sizes, effective thicknesses, perforation thicknesses, locations of impermeable beds, values of permeability, production pressure differential and horizontal well technology, were investigated by numerical simulation method. It can be seen from the results, such factors as aquifer sizes, etc. have influence on water coning to a range of degrees, while horizontal wells can change the effect of 'bottom-water coning' into that of 'bottom-water pushing'. In addition, moving principles of bottom-water in gas reservoirs were figured out and measures to prevent and control water coning were provided in this paper. In conclusion, it is recommended that horizontal well technology be used for gas reservoir development; appropriate un-perforated thickness be remained when the horizontal well locates in area having favorable effective thickness, high horizontal permeability and low vertical permeability; and the pressure deferential be controlled during the production process.

关 键 词：和田河气田 底水气藏 裂缝(地质) 碳酸盐岩 水锥 机理 数值模拟 开发 建议 

分 类 号：P618.13[天文地球—矿床学]