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1. 中国石油天然气股份有限公司 长庆油田分公司 第二采气厂, 西安 710200;
2. 西安石油大学 地球科学与工程学院, 西安 710065;
3. 陕西省油气成藏地质学重点实验室, 西安 710065;
4. 延安大学 石油工程与环境工程学院, 延安 716000
详细信息
1. 中国石油天然气股份有限公司 长庆油田分公司 第二采气厂, 西安 710200;
2. 西安石油大学 地球科学与工程学院, 西安 710065;
3. 陕西省油气成藏地质学重点实验室, 西安 710065;
4. 延安大学 石油工程与环境工程学院, 延安 716000
Micro characteristics and formation mechanism of low-quality gas reservoirs in Taiyuan Formation of Shenmu Gas Field
1. Second Gas Production Plant, Changing Oilfield Company, Xi'an, Shaanxi 710020, China;
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an, Shaanxi 710065, China;
3. College of Earth Sciences & Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
4. School of Petroleum Engineering and Environmental Engineering, Yan'an University, Yan'an, Shaanxi 716000, China
1. Second Gas Production Plant, Changing Oilfield Company, Xi'an, Shaanxi 710020, China;
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an, Shaanxi 710065, China;
3. College of Earth Sciences & Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
4. School of Petroleum Engineering and Environmental Engineering, Yan'an University, Yan'an, Shaanxi 716000, China
鄂尔多斯盆地神木气田与周边气田开发效果差异较大,表现出低品质气藏特征,给气田勘探部署及持续稳产带来一定困扰。为了揭示低品质气藏成因,基于不同尺度微观实验手段,对神木气田太原组储层开展了微观特征及形成机理研究。结果表明,神木气田太原组储层具有"富石英、贫长石、岩屑含量较高"的特征,发育小孔-细喉型孔喉组合,孔喉连通性较差,储渗能力较弱,为低孔-超低渗致密砂岩储层;太原组低品质储层的形成受杂基、喷发岩岩屑含量及成岩作用的共同影响。储层在形成过程中,受晚石炭世-早二叠世鄂尔多斯盆地北部内蒙古古隆起火山活动的影响明显,砂岩内喷发岩岩屑和杂基含量普遍较高,喷发岩岩屑为次生孔隙的发育提供了主要物质基础,杂基在堵塞孔隙的同时也产生了一定数量杂基溶孔,对储层的影响具有双重性。成岩过程中的溶蚀作用对于太原组储层的形成至关重要,增孔效应占现今孔隙度的64.3%。晚白垩世末期,燕山运动末幕导致鄂尔多斯盆地构造反转,气水重新调整,盆地东部天然气沿断裂部分逸散,最终形成了现今神木气田太原组的低品质气藏。神木气田下一步勘探重点应在摸清成岩作用宏观展布规律及有利岩性圈闭的基础上,寻找高含量喷发岩岩屑和低含量杂基的发育区。
Shenmu Gas Field in Ordos Basin shows the characteristics of low quality gas reservoir, and its development effect is quite different from that of surrounding gas fields, which brings some problems to the exploration deployment and sustainable production of the gas field. In order to reveal the origin of lowquality gas reservoirs, the microscopic characteristics and formation mechanism of Taiyuan Formation reservoirs in Shenmu Gas Field were studied based on microscopic experiments at different scales. The results show that the reservoir of Taiyuan Formation in Shenmu Gas Field is characterized by "rich in quartz, poor in feldspar, and high content of rock detritus". The reservoir of Taiyuan Formation is a low porosity and ultra-low permeability tight sandstone reservoir with small pore-fine throat combination, poor pore throat connectivity, and weak reservoir permeability. The formation of low-quality reservoirs in Taiyuan Formation is affected by the matrix, the content of rock detritus in eruptive rocks and diagenesis. During the late Carboniferous to early Permian, the formation of the reservoir was significantly affected by the volcanic activity of the Inner Mongolia ancient uplift in the north of the Ordos Basin. The content of matrix and rock detritus of the eruptive rock in the sandstone was generally high. The rock detritus of the eruptive rock provided the main material basis for the development of secondary pores. While the matrix blocked the pores, it also produced a certain number of matrix dissolved pores, which had a dual impact on the reservoir. The dissolution during diagenesis is critical to the formation of Taiyuan Formation reservoir, and the increased porosity accounts for 64.3% of the current porosity. At the end of the Late Cretaceous, the late Yanshan movement led to the structural inversion of the Ordos Basin, the readjustment of gas and water, and the escape of natural gas along the fault in the eastern part of the basin. Finally, the low quality gas reservoir of Taiyuan Formation in Shenmu Gas Field is formed. The next exploration focus of Shenmu Gas Field should be based on the clear macro distribution law of diagenesis and favorable lithologic traps, and further search for the development area with high content of eruptive rock detritus and low content of matrix.
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