阳信洼陷沙一段生物泥页岩气成藏条件分析

生物泥页岩气是页岩气的重要类型，具有埋藏浅、面积大的特点。通过对阳信洼陷沙一段泥页岩沉积环境、构造背景、地化特征分析，认为沙一段烃源岩具备形成生物泥页岩气的有利条件。沙一段泥页岩为优质烃源岩，厚度大、分布面积广．烃源岩埋深1200～1800m、地层温度54．0～63．0℃为生物气的生烃高峰时期。沙一段具有快速沉积、成化湖盆的特征，为烃源岩的保存及生物泥页岩气的生成提供了有利沉积背景。烃源岩生成的生物泥页岩气在烃源岩内就近聚集，表现为典型的原地成藏模式。预测洼陷中部气测异常较大值区带是生物泥页岩气的有利发育区。

Accumulation condition analysis on biological shale gas of Es1 Member in Yangxin Subsag

Biological shale gas is an essential type of shale gas. It has the characteristics of shallow burial depth and large area.According In the analysis of the depositional environment, the structural setting and the geochemical charaeteristics of ESl Member shale in Yangxin Subsag, this paper points out that the Esn Member source rock has the favorable conditions generating biologicalshale gas. The Es1 Member shale is high quality source rock with large thickness and area. The depth of Es1 Member source rock is from 1,200 Iol,800 m, temperature is from 54.0 to 63.0 ℃ Source rock is in biogenic gas hydrocarbon generation peak period. Es1Member has the characteristics of rapid deposition and salty lake basin, which provides faorable preservation condition and hydrocarbon-generation condition. The biological shale gas generated from source rock aeeumulates nearby, showing the typical in-silu aecumulation mode. The middle area with large abnormal value in Yangxin Subsag is the favorable development zone of biologieal shale gas.