Бассейн: Krishna - Godavari (ID: 828)

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Площадь: 130037.77 км²

Описание

Krishna-Godavari Basin

Bay of Bengal. Located in offshore areas to the east of the Indian continent, west of Myanmar–Andaman–Sumatra and south to Bangladesh, the Bay of Bengal contains multiple continental margin petroliferous basins. According to plate positions and structural features, these basins can be classified into three categories: passive continental margin basins (including Mahanadi, Krishna–Godavari and Cauvery Basin) in the west; active continental margin basins (including Rakhine, Martaban, Andaman and the North Sumatra Basin) in the east, and residual oceanic basins (Bengal Basin) in the north (Fig. 1).

Fig. 1. Distribution of basins in the Bay of Bengal (according to Refs).

Majority of deepwater discoveries in the Bay of Bengal is distributed in the passive continental margin basins in the west. For example, the Krishna–Godavari Basin experienced Pre-Jurassic craton development, Jurassic–Early Cretaceous rifting, late Early Cretaceous–late Late Cretaceous passive continental margin and Paleocene–present neotectonic stages, with sedimentation of extremely thick stratigraphic sequences of rifting and post-rifting periods (Fig. 2).

Fig. 2. Geological section of the Krishna-Godavari Basin in the Bay of Bengal (according to Ref.).

In the Bay of Bengal, key hydrocarbon source rocks include Cretaceous and Paleogene marine hydrocarbon source rocks; reservoirs are dominated by delta–littoral sandstone, and mostly channel sandstone and turbidite sandstone in deepwater areas; cap rocks are dominated by delta–littoral shale. Majority of traps are structural traps of the shifting period, and hydrocarbons migrate along faults to form pools.

Hydrocarbon exploration in the Bay of Bengal involves 3 key players: India, Myanmar and Bangladesh. Currently, exploration operations are conducted predominantly in on-shore and shallow-water zones of peripheral basins. In the past few years, discoveries for deepwater natural gas were made in Krishna–Godavari, Cauvery and Rakhine basins (Table 1). These discoveries show that deepwater areas in these basins have bright prospects for natural gas exploration.

Table 1. Major deepwater gas fields in the Bay of Bengal.

Data source: Giant discoveries of oil and gas fields in global deepwaters in the past 40 years and the prospect of exploration. Gongcheng Zhang, Hongjun Qu, Guojun Chen, Chong Zhao, Fenglian Zhang, Haizhang Yang, Zhao Zhao, Ming Ma. 2019

Следующий Бассейн: Chatham Rise