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首页> 外文期刊>Journal of Asian earth sciences >Influence of overpressure on formation velocity evaluation of Neogene strata from the eastern Bengal Basin, Bangladesh
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Influence of overpressure on formation velocity evaluation of Neogene strata from the eastern Bengal Basin, Bangladesh

机译：超压对孟加拉国东部孟加拉盆地新近系地层形成速度评价的影响

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摘要

Interpretation of sonic log data of anticlinal structures from eastern Bangladesh reveals significant variations of acoustic velocity of subsurface strata. The amount of variation in velocity is 32% from Miocene to Pliocene stratigraphic units in Titas and Bakhrabad structure, whereas 21% in Rashidpur structure. Velocity fluctuations are influenced by the presence of gas-bearing horizons, with velocities of gas-producing strata 3-7% lower than laterally equivalent strata at similar depth. Average velocities of Miocene Boka Bil and Bhuban formations are, respectively, 2630 and 3480 m/s at Titas structure; 2820 and 3750 m/s at Bakhrabad; and 3430 and 3843 m/s at the Rashidpur structure. From the overall velocity-depth distribution for a common depth range of 915-3000 m, the Titas, Bakhrabad and Rashidpur structures show a gradual increase in velocity with depth. In contrast, the Sitakund anticline in SE Bangladesh reveals a decrease in velocity with depth from 3000 to 4000 m, probably due to the presence of overpressured mudrocks of the Bhuban Formation. Tectonic compression, associated with the Indo-Burmese plate convergence likely contributed the most toward formation of subsurface overpressure in the Sitakund structure situated in the Chittagong-Tripura Fold Belt of the eastern Bengal basin, Bangladesh.
机译：孟加拉国东部背斜构造的声波测井资料的解释揭示了地下地层声速的显着变化。在Titas和Bakhrabad结构中，从中新世到上新世地层单位的速度变化量为32％，而在Rashidpur结构中则为21％。速度波动受含气层的存在影响，在相似深度，产气层的速度比侧向等效地层的速度低3-7％。 Titas构造的中新世Boka Bil和Bhuban地层的平均速度分别为2630和3480 m / s。巴赫拉巴德2820和3750 m / s;在拉希德布尔（Rashidpur）结构处为3430和3843 m / s。从915-3000 m共同深度范围的整体速度-深度分布来看，Titas，Bakhrabad和Rashidpur结构显示出速度随深度逐渐增加。相比之下，孟加拉国东南部的Sitakund背斜揭示出速度随深度从3000 m减小到4000 m，这可能是由于布班组存在超压泥岩。与孟加拉-印度板块汇聚有关的构造压缩可能对孟加拉国东部孟加拉盆地吉大港-特里普拉-褶皱带中的Sitakund结构中地下超压的形成贡献最大。

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