苏里格气田苏10区块储层特征及开发技术策略研究
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摘要
在结合区域地质背景、详细解剖取心井的基础上,根据岩石类型、沉积结构、沉积构造、沉积旋回、沉积韵律以及测井曲线等资料进行综合分析,确定砂体的沉积微相类型为河道、心滩、边滩、决口扇、河漫滩、沼泽。通过取心井测井相分析,建立了沉积微相—测井曲线的响应关系,进行全区沉积微相的划分,研究沉积微相的组合关系和展布特征。根据苏10区块岩心分析化验资料和完钻井统计数据,储层具有低孔低渗特点,盒8段下部储层物性好于盒8段上部和山1段;储层层间非均质性严重,且从下至上非均质性增强。影响储层物性的主要因素有成岩作用和沉积作用,高能水道心滩是粗岩相带沉积的最主要位置,是控制苏里格气田有效储层分布的最主要因素。
为改善区块开发中出现直井单井控制储量低、气井产量低、压力下降快、稳产能力较差等问题,针对低渗、低压、低丰度岩性气藏的地质特征及生产特点开展了水平井技术攻关与试验研究。目前已在苏10区块完钻水平井5口,投产5口,日产气3～18万方/天,生产效果较好。随着气藏认识的加深,以单井产量高为主要特征的水平井钻、完井技术日趋完善,为开发低渗透气藏提供了重要的技术手段。
按照方案要求,苏10区块在2008年至2017年稳产期期间每年钻井60口(累积钻井600口)以弥补产量递减,保持天然气生产能力在10×108m3/a。因此,深入开展储层特征研究、寻找含气富集区、针对储层特点进行开发技术策略研究,对保证区块钻高效新井、保持稳产具有重要意义。
Basis on the regional geological setting and anatomical detail coring, it was determined the sedimentary sand microfacies types are channel deposit, channel bar, point bar deposit, crevasse splay deposit, flood plain deposit, swamp deposit by multidisciplinary analysis of deposition and logging datum. The curve of relationship between the sedimentary facies and logging the response was established. The microfacies of block were divisioned. The combination of relations and the distribution characteristics of the microfacies were studied. Reservoir has low porosity and permeability characteristics. The properties of lower He 8 formation are better than Shan 1 formation and top of He 8 formation. The non-homoge are serious and the non-homogeneous enhance from to bottom. The main affecting factors of the reservoir properties are diagenesis and sedimentation. High-energy waterway piont bat was main location of coarse waste precipitation facie. It is the most important factor to control the distribution of effective reservoir in Sulige gas field.
In order to improve the problems appeared in the development such as a single well controlled reserves of vertical wells is low, gas production is low, the pressure drop quickly, and stable yield less capable, and so on, horizontal well technology research has carried out by GREAT WALL company which were aimed at the production characteristics and geological features of low permeability, low pressure, low-abundance lithologic gas reservoir. It has drilled 5 horizontal wells in Su 10 block at the moment. They were put into production. The daily production are 3～18×104m3/d. The production effects are better. With the deepening of understanding of gas reservoir, horizontal well drilling and completion techniques by high production per well as the main features are being further improved. It is provides an important technical means for the development of low permeability gas reservoir.
Accordance with program requirements, during the period of stabilized production from 2008 to 2017, it will drill 60 straight wells per year (cumulative drilling 600 straight wells) to compensate for production decline to keep natural gas production in the 10×108m3/a. So it is important to drill effectively wells and maintain stable production to conduct reservoir characteristics thoroughly, looking for gas-rich region and development technology strategy in view of reservoir characteristics.
为改善区块开发中出现直井单井控制储量低、气井产量低、压力下降快、稳产能力较差等问题,针对低渗、低压、低丰度岩性气藏的地质特征及生产特点开展了水平井技术攻关与试验研究。目前已在苏10区块完钻水平井5口,投产5口,日产气3～18万方/天,生产效果较好。随着气藏认识的加深,以单井产量高为主要特征的水平井钻、完井技术日趋完善,为开发低渗透气藏提供了重要的技术手段。
按照方案要求,苏10区块在2008年至2017年稳产期期间每年钻井60口(累积钻井600口)以弥补产量递减,保持天然气生产能力在10×108m3/a。因此,深入开展储层特征研究、寻找含气富集区、针对储层特点进行开发技术策略研究,对保证区块钻高效新井、保持稳产具有重要意义。
Basis on the regional geological setting and anatomical detail coring, it was determined the sedimentary sand microfacies types are channel deposit, channel bar, point bar deposit, crevasse splay deposit, flood plain deposit, swamp deposit by multidisciplinary analysis of deposition and logging datum. The curve of relationship between the sedimentary facies and logging the response was established. The microfacies of block were divisioned. The combination of relations and the distribution characteristics of the microfacies were studied. Reservoir has low porosity and permeability characteristics. The properties of lower He 8 formation are better than Shan 1 formation and top of He 8 formation. The non-homoge are serious and the non-homogeneous enhance from to bottom. The main affecting factors of the reservoir properties are diagenesis and sedimentation. High-energy waterway piont bat was main location of coarse waste precipitation facie. It is the most important factor to control the distribution of effective reservoir in Sulige gas field.
In order to improve the problems appeared in the development such as a single well controlled reserves of vertical wells is low, gas production is low, the pressure drop quickly, and stable yield less capable, and so on, horizontal well technology research has carried out by GREAT WALL company which were aimed at the production characteristics and geological features of low permeability, low pressure, low-abundance lithologic gas reservoir. It has drilled 5 horizontal wells in Su 10 block at the moment. They were put into production. The daily production are 3～18×104m3/d. The production effects are better. With the deepening of understanding of gas reservoir, horizontal well drilling and completion techniques by high production per well as the main features are being further improved. It is provides an important technical means for the development of low permeability gas reservoir.
Accordance with program requirements, during the period of stabilized production from 2008 to 2017, it will drill 60 straight wells per year (cumulative drilling 600 straight wells) to compensate for production decline to keep natural gas production in the 10×108m3/a. So it is important to drill effectively wells and maintain stable production to conduct reservoir characteristics thoroughly, looking for gas-rich region and development technology strategy in view of reservoir characteristics.
引文
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