偏泥相
The black graptolite shale facies indicate a deep-water, half enclosed and anoxic sedimentary environment.
中奥陶世黑色的笔石页岩为典型的半封闭缺氧的深水沉积环境,反映了海水逐步加深,水体也变得相对宁静.
The Upper Triassic Formation is sub-abysmal basinal facies deposit in the south and north depressions. A black shale layer developed.
上三叠统在南、北坳陷为次深海盆地相沉积,发育一套黑色页岩烃源层;
The sediments are mudstone , shale, carbonaceous mudstone and marl of deep and semi-deep lake facies.
烃源岩已进入成熟阶段, 处于生油高峰期.
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