当前位置：
X-MOL 学术
›
Acta Geol. Sinica Engl. Ed.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Geological Interpretation and Hydrocarbon Exploration Potential of Three Types of Mound‐shaped Reflectors in the Meishan Formation, Southern Qiongdongnan Basin
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-01-08 , DOI: 10.1111/1755-6724.14636 Yangwei FENG 1, 2, 3, 4 , Hongjun QU 5 , Yan REN 1, 4 , Li JIN 4
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-01-08 , DOI: 10.1111/1755-6724.14636 Yangwei FENG 1, 2, 3, 4 , Hongjun QU 5 , Yan REN 1, 4 , Li JIN 4
Affiliation
|
Many mound‐shaped reflectors with different features and shapes are evident in the Upper Member of the Meishan Formation from seismic profiles taken in the deep‐water area of the Southern Qiongdongnan Basin. Based on the drilling, 2D and 3D seismic data from the study area, descriptions of the seismic reflection characteristics as well as the geometric shape, wave impedance inversion, analogy and comparative analyses are carried out. Taken in conjunction with research on the paleostructure and paleosedimentary background, we consider that the mound‐shaped seismic reflectors are distributed in the Southern Slop belt and the Southern High‐rise of the Qiongdongnan Basin, which can be subdivided into three types: reefs, contourite mounds and magmatic diapirs. The first type, reefs, includes patch reefs, platform marginal reefs and pinnacle reefs. Patch reefs present mound‐shaped seismic facies with medium frequency and a moderately strong amplitude, being distributed at the uplift of the fault control platform on the Southern Slop belt. The platform marginal reefs have flat mound‐shaped seismic facies with strong amplitude and medium frequency, developing at the margin of the carbonate platform in the Southern High‐rise. The pinnacle reefs have mound‐shaped seismic facies with strong amplitude and medium frequency and are developed on an isolated volcanic cone. The boundaries between individual reefs are clear on the seismic section, with reef ridge and reef ditch developed, the phenomenon of ‘front product’ being visible within, two‐way superelevation between wings is developed and they exist visibly as mounds in any viewed direction of the cross‐section. They are slightly asymmetrical in the direction perpendicular to the paleodepth, the reef body being steep near the deep‐water side, while being gentle near the shallow water side. The wave impedance of a patch reef is about 7 kg/m3×m/s, while the wave impedance of a platform marginal reef is about 7.5 kg/m3×m/s. The second type ‐ contourite mounds ‐ are mainly developed under the slope break of the southern slope fault control platform's edge. They are subdivided into two types: conical and flat. The former has mound‐shaped seismic facies with medium‐strong amplitude and low frequency, the latter having mound‐shaped seismic facies with medium amplitude and low frequency. The internal texture of the mounds is not clear on the seismic section, with the boundaries between contourite mounds being blurred. They are mound‐shaped only in cross‐section, being banded in the extending direction. The upper surface of a single contourite mound is relatively gentle near the deep‐water side, while being steep near the shallow water area. The wave impedance of contourite mounds is about 5.8 kg/m3×m/s, which is speculated to represent a marly to calcareous clastic deposit. The third type is the magmatic diapir, which has ‘roots’. They have a dome‐shaped upper boundary, are bottomless, with a chaotic interior. They penetrated multiple formations, opening towards the base. There are two major accumulation assemblages of reefs, one is the platform margin reef accumulation assemblage with distant source rocks and long‐distance migration through an unconformity surface in the Southern High‐rise, the other is the patch reef accumulation assemblage with twin sources and short distance migration through faults in the Southern Slop belt near the Central Depression zone. The latter is the main exploration targets at present. There are contourite mound accumulation assemblages with nearby source rocks and short distance vertical migration through faults, which are potentially important targets. The magmatic diapirs pierce the overlying strata and form good hydrocarbon traps and migration pathways, thus representing potential prospecting targets.
中文翻译：
琼东南盆地南部梅山组三种类型的丘状反射器的地质解释和油气勘探潜力
根据琼东南南盆地深水区的地震剖面，在梅山组的上半部可以看到许多具有不同特征和形状的丘状反射器。基于研究区域的钻井，2D和3D地震数据，对地震反射特征以及几何形状，波阻抗反演，类比和比较分析进行了描述。结合古构造和古沉积背景的研究，我们认为丘状地震反射器分布在琼东南盆地的南坡带和南部高层上，可分为三种类型：礁石，轮廓石丘和岩浆底盘。第一类是礁石，包括斑驳礁石，平台边缘礁石和顶峰礁石。斑块礁呈丘状地震相，频率中等，振幅适中，分布在南斜坡带断裂控制平台的隆起处。平台边缘礁具有平坦的丘状地震相，具有强烈的振幅和中频，在南部高层的碳酸盐岩平台边缘发育。顶峰礁具有丘状的地震相，具有强烈的振幅和中等频率，并发育在孤立的火山锥上。各个珊瑚礁之间的边界在地震剖面上是清晰的，形成了珊瑚礁脊和珊瑚礁沟，在内部可见“前部产物”的现象，机翼之间出现了双向超高现象，并且它们在任何观察方向上都以丘的形式存在。横截面。它们在垂直于古深度的方向上是不对称的，礁体在深水侧附近较陡，而在浅水侧附近则较平缓。礁石的波阻抗约为7 kg / m3 ×m / s，而平台边缘礁的波阻抗约为7.5 kg / m 3×米/秒 第二种类型-轮廓土丘-主要在南部斜坡断层控制平台边缘的斜坡断裂处发育。它们分为两种类型：圆锥形和扁平形。前者具有中等强度和低频的丘状地震相，后者具有中等强度和低频的丘状地震相。在地震剖面上，土丘的内部纹理不清楚，轮廓石土丘之间的边界变得模糊。它们仅在横截面上呈丘形，并在延伸方向上绑扎。单个轮廓土堆的上表面在深水侧附近相对较平缓，而在浅水区域附近较陡。contour石丘的波阻抗约为5.8 kg / m 3×m / s，据推测代表着从马来钙质碎屑矿床。第三种是岩浆成岩，具有“根”。它们具有穹顶形的上边界，无底，内部混乱。他们穿透了多个编队，向基地开放。礁石的聚集主要有两种，一种是远缘烃源岩的台地边缘礁石聚集组合，以及南部高层不整合面的长距离运移，另一种是双生源短短斑块礁聚集组合。中央De陷带附近南斜坡带断层的远距离迁移。后者是目前的主要勘探目标。围岩丘堆积与附近的烃源岩组合以及通过断层的短距离垂直运移是潜在的重要目标。岩浆底盘穿透上覆地层，形成良好的油气圈闭和运移通道，从而代表了潜在的勘探目标。
更新日期：2021-02-22
中文翻译：
琼东南盆地南部梅山组三种类型的丘状反射器的地质解释和油气勘探潜力
根据琼东南南盆地深水区的地震剖面，在梅山组的上半部可以看到许多具有不同特征和形状的丘状反射器。基于研究区域的钻井，2D和3D地震数据，对地震反射特征以及几何形状，波阻抗反演，类比和比较分析进行了描述。结合古构造和古沉积背景的研究，我们认为丘状地震反射器分布在琼东南盆地的南坡带和南部高层上，可分为三种类型：礁石，轮廓石丘和岩浆底盘。第一类是礁石，包括斑驳礁石，平台边缘礁石和顶峰礁石。斑块礁呈丘状地震相，频率中等，振幅适中，分布在南斜坡带断裂控制平台的隆起处。平台边缘礁具有平坦的丘状地震相，具有强烈的振幅和中频，在南部高层的碳酸盐岩平台边缘发育。顶峰礁具有丘状的地震相，具有强烈的振幅和中等频率，并发育在孤立的火山锥上。各个珊瑚礁之间的边界在地震剖面上是清晰的，形成了珊瑚礁脊和珊瑚礁沟，在内部可见“前部产物”的现象，机翼之间出现了双向超高现象，并且它们在任何观察方向上都以丘的形式存在。横截面。它们在垂直于古深度的方向上是不对称的，礁体在深水侧附近较陡，而在浅水侧附近则较平缓。礁石的波阻抗约为7 kg / m3 ×m / s，而平台边缘礁的波阻抗约为7.5 kg / m 3×米/秒 第二种类型-轮廓土丘-主要在南部斜坡断层控制平台边缘的斜坡断裂处发育。它们分为两种类型：圆锥形和扁平形。前者具有中等强度和低频的丘状地震相，后者具有中等强度和低频的丘状地震相。在地震剖面上，土丘的内部纹理不清楚，轮廓石土丘之间的边界变得模糊。它们仅在横截面上呈丘形，并在延伸方向上绑扎。单个轮廓土堆的上表面在深水侧附近相对较平缓，而在浅水区域附近较陡。contour石丘的波阻抗约为5.8 kg / m 3×m / s，据推测代表着从马来钙质碎屑矿床。第三种是岩浆成岩，具有“根”。它们具有穹顶形的上边界，无底，内部混乱。他们穿透了多个编队，向基地开放。礁石的聚集主要有两种，一种是远缘烃源岩的台地边缘礁石聚集组合，以及南部高层不整合面的长距离运移，另一种是双生源短短斑块礁聚集组合。中央De陷带附近南斜坡带断层的远距离迁移。后者是目前的主要勘探目标。围岩丘堆积与附近的烃源岩组合以及通过断层的短距离垂直运移是潜在的重要目标。岩浆底盘穿透上覆地层，形成良好的油气圈闭和运移通道，从而代表了潜在的勘探目标。
京公网安备 11010802027423号