Structural characteristics and exploration fields of No.1 Faulted Slope Break in Tazhong area
Structural characteristics and exploration fields of No.1 Faulted Slope Break in Tazhong area
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DOI：
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发表时间：
2005
影响因子：
1.8
通讯作者：
WU Guang-hui
中科院分区：
文献类型：
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作者：
WU Guang-hui
以新的三维地震资料为基础，通过等层序格架和构造分析，研究了塔中1号构造带复杂的构造特征和油气聚集的差异性。研究表明，塔中1号构造带是早奥陶世末至晚奥陶世初大型逆冲带长期剥蚀形成的复杂断裂坡折带。沿着碳酸盐岩坡折带发育了上奥陶统良吕洞组碳酸盐岩生物礁与台地边缘滩的复合体。塔中1号断坡折带根据转换带的可容性可分为5个不同几何形态和发育特征的部位，造成了油气聚集的差异性。塔中-塔中44区块发育厚层的碳酸盐岩礁滩复合体。该地区沿着坡折带碳酸盐岩产量高、产量稳定，是有利勘探区。塔中-塔北45断块存在强烈的构造作用和岩溶作用。该地区具有形成大型储层的有利前景。这两个带是大型油气田的主要勘探目标。
Based on the new 3D seismic data, the complex structural characteristics and the difference of oil and gas accumulation in Tazhong No.1 Structural Zone were studied with the isochronous sequence framework and structure analysis. It is indicated that Tazhong No.1 Structural Zone is a complicated faulted slope break resulted from a large thrust belt eroded for a long time from the end of the early Ordovician to the early of the late Ordovician. A composite of carbonate reefs and banks of platform margin in Lianglitage Formation of the Upper Ordovician was developed along the carbonate slope break. Tazhong No.1 Faulted Slope Break can be divided into five parts with different geometry and development characteristics by the accommodation of transfer zones,which caused the difference of oil and gas accumulation. The thick composite of carbonate reefs and banks in rimed shelf is located in the Tazhong-44 Block. This area is the favorable exploration district and has high and stable production of carbonate along the slope break. There are intensive structural effect and Karst process in Tazhong-45 Block. This area has an advantageous prospect for a large scale fracture-hole reservoir. The two zones are main exploration targets for large oil and gas fields.