盒8、山1段致密气藏地层水赋存机理及主控因素--以苏里格某区块为例  

Occurrence mechanism of formation water in Shihezi 8 and Shanxi 1 tight gas reservoirs and its main control factors: An example from one block in Sulige gasfield

作　　者：刘会会[1,2] 崔越华[1,2] 夏守春[1,2] 刘雪玲 费世祥[1,2] 王准备[1,2] Liu Huihui;Cui Yuehua;Xia Shouchun;Liu Xueling;Fei Shixiang;Wang Zhunbei(Exploration and Development Research Institute,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China;National Engineering Laboratory of Low-Permeability Oil&Gas Exploration and Development,Xi'an,Shaanxi 710018,China)

机构地区：[1]中国石油长庆油田公司勘探开发研究院,710018 [2]低渗透油气田勘探开发国家工程实验室

出　　处：《天然气勘探与开发》2020年第1期84-91,共8页Natural Gas Exploration and Development

基　　金：国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(编号:2016ZX05050)。

摘　　要：针对苏里格某区致密含水气藏储量基数大、动用程度低、气井普遍产水等开发难点,综合利用地质、动态资料等一体化分析,深入研究了地层水赋存机理及其主控因素。结果表明:①中二叠统盒8、下二叠统山1段气藏地层水具有中等偏高矿化度特征,属于封闭环境下的局部滞留水;②地层水微观产状主要为束缚水、毛细管水、自由水,宏观赋存样式主要为构造低部位滞留水、透镜状滞留水、孤立透镜体水,明确了苏里格某区不同类型储层内部地层水赋存及其开发特征;③毛细管力和天然气向上浮力控制了地层水的产状,导致气水垂向分异不明显、气水两相混储,生烃强度、成岩作用、储层非均质性、构造特征控制了地层水的赋存样式及空间分布。结论认为:①构造低部位滞留水主要分布在局部构造低点的高渗河道砂体发育区;②透镜状滞留水主要分布在构造低洼平缓的河道充填相致密厚层砂体内部;③孤立透镜体水主要分布在河道间孤立砂体发育区。in most water-bearing tight gas reservoirs in one block of Sulige gasfield, there are several difficulties during their development, such as large reserves base, low production degree, and most gas wells with water production. So, based on an analysis on geological and dynamic data, the occurrence mechanism of formation water and its main control factors were summed up. Results show that(1) the formation water in these gas reservoirs of both Middle Permian Shihezi 8 Member and Lower Permian Shanxi 1 Member is featured by medium to high salinity, and belongs to a kind of local retained water in closed environment;(2) microscopically, its occurrences are chiefly bound water, capillary water, and free water, whereas macroscopically, they are mainly structural low-position retained water, lenticular retained water, and isolated lenticular water. And the occurrences and development characteristics of the formation water in different types of reservoirs in the case block of Sulige are clarified;(3) its occurrences are under the control of capillary force and upward buoyancy of natural gas, which may lead to indistinct gas-water vertical differentiation and gas-water dual-phase mixed preservation. The occurrence pattern and spatial distribution of the formation water are controlled by hydrocarbon-generating intensity, diagenesis, reservoir heterogeneity, and structural characteristics. In conclusion, the structural low-position retained water is basically distributed at some high-permeability sandbody development areas of local structural low position, the lenticular retained water inside the structurally low and gentle, tight and thick sandbody of channel fill facies, and the isolated lenticular water in the inter-channel isolated sandbody development areas, individually.

关 键 词：早、中二叠世 致密砂岩气藏 地层水 产出状态 赋存样式 控制因素 甜点区预测 开发技术对策 

分 类 号：P618.13[天文地球—矿床学] TE37[天文地球—地质学]