五宝场构造沙溪庙组上段储层裂缝展布规律研究
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摘要
五宝场及所属的川东北地区位于扬子地块的北缘,大巴山弧形构造带西南侧,川东滑脱褶皱构造带北部。地史时期板块的裂解与拼合,不同时期不同微板块之间的碰撞、拼接和板内逆冲推覆造山运动此起彼伏,强烈地影响着本区,并在此叠加复合,形成十分复杂的构造格局。五宝场盆地基底之上的沉积盖层发育齐全,中生界上三叠统至白垩系地层,均是碎屑岩沉积。随着油气勘探程度的不断提高,五宝场构造沙溪庙组上段的致密低渗透性裂缝储层成为了重要的勘探领域,因此,其储层裂缝展布规律研究势在必行,成为本区域石油勘探的重要研究课题之一。
在充分掌握和消化已有的大量研究成果的基础上,结合本次研究的目的,以构造地质学、沉积岩石学、测井、地震等相关理论和研究方法为指导,运用点与面、微观与宏观相结合的方法,完成以下几方面研究:1.逐级分析研究区的构造特征、样式及其对中侏罗统沙溪庙组上段裂缝的控制作用。2.利用研究区录井资料、测井响应特征、三维地震资料的特殊处理,进行裂缝检测。3.综合构造、裂缝预测、钻井、测井和生产动态资料,综合分析沙溪庙组上段裂缝平面展布特征。其技术思路是:从大地构造背景、川东北区域构造、五宝场构造逐级分析构造对裂缝发育控制作用;通过野外剖面节理观测、录井资料分析、钻井岩心观察、岩心显微镜观察对裂缝进行倾向、走向统计与理论分析;通过各种测井方法对测井资料进行裂缝评价;通过对地震数据的特殊处理与解释从而进行地震数据的裂缝检测;综合分析储层裂缝展布特征。
通过五宝场构造沙溪庙组上段储层裂缝展布规律研究,取得了以下主要成果与认识:
(1)按沉积旋回自下而上把五宝场构造沙溪庙组上段分为四个亚段,底部沙二1嘉祥寨砂岩是沙溪庙组的主要产气砂体。
(2)沙二1、沙二2、沙二3砂岩属典型的低孔低渗储层,仅靠岩石基块孔隙难以有工业气流产出。
(3)复合型应力场控制了五宝场构造裂缝系统。区块内大部分断层落差小、延伸距离短,未对圈闭造成明显破坏作用,而对储层储渗条件的改善具有积极作用。
(4)五宝场构造沙溪庙组上段裂缝分布规律和测井响应特征为裂缝发育段的深浅双侧向出现正或负的差异,同时补偿声波出现跳波的现象,甚至呈尖峰状高值。
(5)沙溪庙组上段裂缝总体上由北而南分布了4～5个北西—南东向不规则裂缝发育带。
Wubaochang gas field belongs to Northeast Sichuan basin which is located at the southwest side of Daba arc tectonic belt and the north of East Sichuan detachment fold belts in northern margin of Yangtze Block. This region was effected strongly by cracking and merger of plates during the history, the collision and splicing of different micro-plates in different periods, and intraplate thrust orogeny for one after another, whose superposition and compound formed a very complex structural pattern. Sedimentary cover on the Wubaochang basement is completely developed, the formation from Upper Triassic Series of Mesozoic group to Cretaceous are all clastic sedimentary. With the constant improvement of oil and gas exploration degree, compacted and low permeable fractured reservoir of the supper Shaximiao formation in the Wubaochang gas field has become an important exploration areas.Therefore, the rule of distribution of reservoir fractures is imperative, as one of the important research topics on oil exploration in the region.
Based on Fully grasping and digesting a large number of studies that have been done, combined with the purpose of this study, guided from structural geology, sedimentary petrology, logging, seismic and other related theories, we use the method that points combined with surfaces, micro combined with the macro, and completed the following aspects: 1. Sequential analysis of the structural characteristics and style in the study area, and its control of fractures on the supper Shaximiao formation. 2. Crack detection from the special processing data of logging data, logging response characteristics and three-dimensional seismic. 3. Comprehensive analysis of the fractures plane distribution characteristics on the upper Shaximiao formation by structure geology, fracture prediction, drilling, logging and production performance data. The technical idea is: we study the control of structures to fractures by analysis of the tectonic setting, northeast regional structure and Wubaochang structure; we statistical and theoretical analysis the factures attitude through field observations, logging data analysis, drilling cores observation, and microscopic observation; fractures evaluation through a variety of logging methods; fracture detection through special processing of seismic data and interpretation of seismic data; comprehensive analysis of fractures distribution characteristics.
Though the study of distribution rule of reservoir fractures on the supper Shaximiao formation in the Wubaochang gas field, we achieved with the awareness of the following main results:
(1) The supper Shaximiao formation in the Wubaochang gas field can be divided into four sub-Shaximiao section by sedimentary cycles from bottom to top, the section Sha21 at the bottom that often be called Shaxiangzhai sandstone, is the main gas sand in the supper Shaximiao formation.
(2) Sha21, Sha22, Sha23 are typical sandstone reservoirs with low porosity and low permeability, there aren’t industrial gas output if only depend on pore of block-based hard rock.
(3) Complex stress field controls the fracture system of Wubaochang gas field. Most of the faults in the field are small, extending a short distance without causing obvious detrimental effects on the trap, and have an active role in the improvement of reservoir conditions.
(4) Crack distribution and logging response characteristics of the the supper Shaximiao formation in the Wubaochang gas field are that depth laterolog turn up to the positive or negative difference in the fractured section
(5) The distribution of fractures on the supper Shaximiao formation could be summarized for 4 ~ 5 North West - South East irregular fracture zone from north to south.
在充分掌握和消化已有的大量研究成果的基础上,结合本次研究的目的,以构造地质学、沉积岩石学、测井、地震等相关理论和研究方法为指导,运用点与面、微观与宏观相结合的方法,完成以下几方面研究:1.逐级分析研究区的构造特征、样式及其对中侏罗统沙溪庙组上段裂缝的控制作用。2.利用研究区录井资料、测井响应特征、三维地震资料的特殊处理,进行裂缝检测。3.综合构造、裂缝预测、钻井、测井和生产动态资料,综合分析沙溪庙组上段裂缝平面展布特征。其技术思路是:从大地构造背景、川东北区域构造、五宝场构造逐级分析构造对裂缝发育控制作用;通过野外剖面节理观测、录井资料分析、钻井岩心观察、岩心显微镜观察对裂缝进行倾向、走向统计与理论分析;通过各种测井方法对测井资料进行裂缝评价;通过对地震数据的特殊处理与解释从而进行地震数据的裂缝检测;综合分析储层裂缝展布特征。
通过五宝场构造沙溪庙组上段储层裂缝展布规律研究,取得了以下主要成果与认识:
(1)按沉积旋回自下而上把五宝场构造沙溪庙组上段分为四个亚段,底部沙二1嘉祥寨砂岩是沙溪庙组的主要产气砂体。
(2)沙二1、沙二2、沙二3砂岩属典型的低孔低渗储层,仅靠岩石基块孔隙难以有工业气流产出。
(3)复合型应力场控制了五宝场构造裂缝系统。区块内大部分断层落差小、延伸距离短,未对圈闭造成明显破坏作用,而对储层储渗条件的改善具有积极作用。
(4)五宝场构造沙溪庙组上段裂缝分布规律和测井响应特征为裂缝发育段的深浅双侧向出现正或负的差异,同时补偿声波出现跳波的现象,甚至呈尖峰状高值。
(5)沙溪庙组上段裂缝总体上由北而南分布了4～5个北西—南东向不规则裂缝发育带。
Wubaochang gas field belongs to Northeast Sichuan basin which is located at the southwest side of Daba arc tectonic belt and the north of East Sichuan detachment fold belts in northern margin of Yangtze Block. This region was effected strongly by cracking and merger of plates during the history, the collision and splicing of different micro-plates in different periods, and intraplate thrust orogeny for one after another, whose superposition and compound formed a very complex structural pattern. Sedimentary cover on the Wubaochang basement is completely developed, the formation from Upper Triassic Series of Mesozoic group to Cretaceous are all clastic sedimentary. With the constant improvement of oil and gas exploration degree, compacted and low permeable fractured reservoir of the supper Shaximiao formation in the Wubaochang gas field has become an important exploration areas.Therefore, the rule of distribution of reservoir fractures is imperative, as one of the important research topics on oil exploration in the region.
Based on Fully grasping and digesting a large number of studies that have been done, combined with the purpose of this study, guided from structural geology, sedimentary petrology, logging, seismic and other related theories, we use the method that points combined with surfaces, micro combined with the macro, and completed the following aspects: 1. Sequential analysis of the structural characteristics and style in the study area, and its control of fractures on the supper Shaximiao formation. 2. Crack detection from the special processing data of logging data, logging response characteristics and three-dimensional seismic. 3. Comprehensive analysis of the fractures plane distribution characteristics on the upper Shaximiao formation by structure geology, fracture prediction, drilling, logging and production performance data. The technical idea is: we study the control of structures to fractures by analysis of the tectonic setting, northeast regional structure and Wubaochang structure; we statistical and theoretical analysis the factures attitude through field observations, logging data analysis, drilling cores observation, and microscopic observation; fractures evaluation through a variety of logging methods; fracture detection through special processing of seismic data and interpretation of seismic data; comprehensive analysis of fractures distribution characteristics.
Though the study of distribution rule of reservoir fractures on the supper Shaximiao formation in the Wubaochang gas field, we achieved with the awareness of the following main results:
(1) The supper Shaximiao formation in the Wubaochang gas field can be divided into four sub-Shaximiao section by sedimentary cycles from bottom to top, the section Sha21 at the bottom that often be called Shaxiangzhai sandstone, is the main gas sand in the supper Shaximiao formation.
(2) Sha21, Sha22, Sha23 are typical sandstone reservoirs with low porosity and low permeability, there aren’t industrial gas output if only depend on pore of block-based hard rock.
(3) Complex stress field controls the fracture system of Wubaochang gas field. Most of the faults in the field are small, extending a short distance without causing obvious detrimental effects on the trap, and have an active role in the improvement of reservoir conditions.
(4) Crack distribution and logging response characteristics of the the supper Shaximiao formation in the Wubaochang gas field are that depth laterolog turn up to the positive or negative difference in the fractured section
(5) The distribution of fractures on the supper Shaximiao formation could be summarized for 4 ~ 5 North West - South East irregular fracture zone from north to south.
引文
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