SEDIMENTARY FACIES OF CARBONIFEROUS IN SICHUAN-HUBEI AREA AND ITS PETROLIFEROU-SNESS
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摘要: 早石炭世早期(岩关期),该区是扬子古陆的一部分,缺失沉积。晚期(大塘期),由于华南海海水自东而西侵入,形成了一条由黄石—沙市—恩施直至川东石柱的一个东西向海槽。海槽中沉积了一套滨海平原及滨岸潮坪相的碎屑夹煤层沉积物。沉积物下段为杂色粘土岩夹灰白色粉砂岩、细砂岩及1—2层薄煤层,含植物化石。上段为褐黄色钙质粘土、灰白色石英砂岩、粉砂岩、粘土岩夹生物碎屑灰岩透镜体及一层铁锰矿。一般厚0—40米,沉积最厚地区在长阳以南,达70多米。Abstract: According to Lithogy, texture, structure of Carboniferous in Sichuan-Hubei area, three facial regions are identified. 1.continental facial region; 2.onshore facial region; 3.carbonate platform facial region. The onshore facial region is well developed in Eastern Sichuan,which is a prospecting zone of oil generation and oil storage. The carbonate platform facial region appears to be a promising reservoir. By analysing the distribution of facial regions, it is suggested that in view of prospecting, gas is more favorite rather than oil; in view of strati-graphic sequence, the Middle Carboniferous System is the best; in view of area, it is the Eastern Sichuan, Western Hubei, and Jianghan are more important.
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