雷竞技app官方版下载ios-雷竞技官方平台
doi: 10.11781/sysydz2023061109
1.
中国石化 油田勘探开发事业部, 北京 100728
2.
中国石化 华东油气分公司, 南京 210019
3.
中国石化 华东油气分公司 勘探开发研究院, 南京 210019
详细信息
中国石化 油田勘探开发事业部, 北京 100728
中国石化 华东油气分公司, 南京 210019
中国石化 华东油气分公司 勘探开发研究院, 南京 210019
Typical difference analysis and benefit-oriented development countermeasures of normal and high pressure shale gas in southeastern Chongqing
1.
SINOPEC Oilfield Exploration and Development Division, Beijing 100728, China
2.
SINOPEC East China Branch Company, Nanjing, Jiangsu 210019, China
3.
Research Institute of Exploration and Development, SINOPEC East China Branch Company, Nanjing, Jiangsu 210019, China
SINOPEC Oilfield Exploration and Development Division, Beijing 100728, China
SINOPEC East China Branch Company, Nanjing, Jiangsu 210019, China
Research Institute of Exploration and Development, SINOPEC East China Branch Company, Nanjing, Jiangsu 210019, China
雷竞技官方平台:
渝东南地区处于四川盆地东南缘的盆缘转换带，发育常压、高压两种类型雷竞技app官方版下载ios气藏。为提高常压雷竞技app官方版下载ios气开发效益，从常压与高压雷竞技app官方版下载ios气典型差异性分析入手，通过开展钻井、岩心观察、实验分析、成藏条件及生产动态等研究，结合渝东南地区雷竞技app官方版下载ios气勘探开发实践，明确了常压雷竞技app官方版下载ios气具有优质雷竞技app官方版下载ios厚度较薄、孔隙度较低、保存条件较差、含气量中等的典型地质特点。常压雷竞技app官方版下载ios气富集受沉积相带、保存条件及地应力场控制，受多期构造改造及差异性抬升影响，形成机理复杂，具有初产较低、稳产期短、递减较慢、返排率高的生产特征。与高压雷竞技app官方版下载ios气在地质特点、富集规律、形成机理及生产规律等方面具有明显的地质特征差异性。针对渝东南地区常压雷竞技app官方版下载ios气资源品位较差的问题，提出了常压雷竞技app官方版下载ios气效益开发的4个关键对策：(1)深化基础地质研究，明确富集规律和甜点目标；(2)建立变井距、长水平段、小夹角、强改造、低高差、控压差的开发技术政策，提高单井产量；(3)加大低成本钻井和高效压裂等工程工艺创新，实现提速提效降本；(4)创新体制机制建设，打造高效组织运行模式。4个关键对策有效促进了常压雷竞技app官方版下载ios气由资源向储量、从储量向效益的转变，助力渝东南常压雷竞技app官方版下载ios气实现规模效益开发。
Abstract:
Southeastern Chongqing is located in the transition zone of the southeastern margin of Sichuan Basin. Shale gas reservoirs of normal and high pressure are developed in this area. In order to promote normal pressure shale gas development benefits, starting from the typical difference analysis of normal and high pressure shale gas, through the research of drilling, core observation, experimental analysis, accumulation conditions, and production dynamics, combined with shale gas exploration and development practices in southeastern Chongqing, it is clarified that the normal pressure shale gas has the typical geological characteristics of small thickness of high-quality shale, low porosity, poor preservation conditions, and medium gas content. The accumulation of normal pressure shale gas is controlled by sedimentary facies, preservation conditions, and in-situ stress field. Affected by multi-stage structural transformation and differential uplift, the mechanism of normal pressure shale gas generation is complex, which has the characteristics of low initial production, short stable production period, slow decline, and high flowback rate. There are obvious differences between normal and high pressure shale gas in geological characteristics, enrichment regularities, generation mechanism, and production law. Considering the poor grade of normal pressure shale gas resources in southeastern Chongqing, four key countermeasures for the benefit-based development of normal pressure shale gas are put forward: (1) The basic geological research is furthered and the enrichment regularities and sweet spots are clarified. (2) The development technology of variable well spacing, long horizontal section, small inclined angle, strong transformation, low height difference and controlled pressure difference is established to increase the production of single well. (3) The innovation of engineering technology such as low-cost drilling and efficient fracturing is increased to achieve speed acceleration, efficiency improvement, and cost reduction. (4) The institutional mechanism is innovated and an efficient organization and operation mode is created. The four key countermeasures effectively promote the transformation of normal pressure shale gas from resources to reserves and from reserves to benefits, facilitating the efficient development of normal pressure shale gas in southeastern Chongqing.
图 1 渝东南地区研究区位置、地层分布(a)与地层综合柱状图(b)
Figure 1. Location, stratigraphic distribution (a), and stratigraphic column (b) of study area in southeastern Chongqing
图 2 渝东南上奥陶统五峰组—下志留统龙马溪组沉积剖面示意
Figure 2. Sedimentary profile of Upper Ordovician Wufeng to Lower Silurian Longmaxi formations in southeastern Chongqing
图 3 渝东南常压区与高压区上奥陶统五峰组—下志留统龙马溪组一段综合对比
Figure 3. Comprehensive correlation of Upper Ordovician Wufeng to Lower Silurian Longmaxi formations in normal and high pressure areas in southeastern Chongqing
图 4 渝东南常压区与高压区优质雷竞技app官方版下载ios有机质孔氩离子抛光扫描电镜照片
a.常压区，③小层; b.常压区, ②小层; c.常压区, ①小层; d.高压区, ③小层；e.高压区, ②小层；f.高压区, ①小层
Figure 4. SEM photographs of organic pores in high-quality shale in normal and high pressure areas in southeastern Chongqing
图 5 渝东南常压区与高压区构造地质剖面示意
Figure 5. Geological profile of structures of normal and high pressure areas in southeastern Chongqing
图 6 渝东南常压区与高压区地应力特征对比
Figure 6. Comparison of in-situ stress characteristics between normal and high pressure areas in southeastern Chongqing
图 7 渝东南常压区与高压区雷竞技app官方版下载ios气成藏模式
Figure 7. Shale gas accumulation patterns of normal and high pressure areas in southeastern Chongqing
图 8 渝东南常压雷竞技app官方版下载ios气气液两相相渗曲线
①压力系数1.3；②压力系数1.2；③压力系数1.1；④压力系数1.0
Figure 8. Gas-liquid two-phase relative permeability curves of normal pressure shale gas in southeastern Chongqing
图 9 渝东南常压雷竞技app官方版下载ios气与高压雷竞技app官方版下载ios气生产阶段模式
Figure 9. Production stage modes of normal and high pressure shale gas in southeastern Chongqing
图 10 渝东南地区有利目标分布
Figure 10. Distribution of favorable targets in southeastern Chongqing
表 1 渝东南地区常压与高压雷竞技app官方版下载ios气地质特征对比
Table 1. Geological characteristics of normal and high pressure shale gas in southeastern Chongqing
地质特征
气藏类型
常压雷竞技app官方版下载ios气
高压雷竞技app官方版下载ios气
沉积
优质雷竞技app官方版下载ios厚24~35 m，TOC含量3.0%~3.3%，石英含量40%~50%，黏土矿物含量30%~40%
优质雷竞技app官方版下载ios厚38~45 m，TOC含量3.5%~4%，石英含量40%~50%，黏土矿物含量30%~40%
储集层
孔隙度3.5%~5.0%，高角度缝及层理缝发育
孔隙度4%~6%，高角度缝相对不发育
构造
处于四川盆地盆缘过渡带及盆外褶皱区，构造抬升较早(距今120~100 Ma)，改造强烈，地层产状陡且变化快
处于四川盆地盆内稳定区，构造抬升较晚(距今80 Ma)，改造相对较弱，地层产状较平缓
保存与赋存
保存条件一般，压力系数0.9~1.3，吸附气占比高(40%~80%)
保存条件较好，压力系数大于1.3，吸附气占比低(25%~40%)
地应力场
地应力较小(40~80 MPa)，最大和最小水平主应力差异系数大，南川地区0.1~0.15，彭水—武隆地区0.2~0.34
地应力适中(50~90 MPa)，最大和最小水平主应力差异小，差异系数0.11~0.13
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