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大量岩石薄片分析表明,中央隆起带淳探1井、富探1井和陕54井区奥陶系风化壳储层中存在次生充填状沥青或炭屑,其成熟度高(RO≈2.0%),光性和生物标志物特征显示为石油裂解的残余物,是古油藏(田)的证据。古油藏位于靖边大气田的下倾方向,其西侧和南侧地层下倾方向的中奥陶统平凉组笔石页岩有机质含量丰富,可能是古油藏的烃源岩。J2—K1期的埋深加大和古地温升高,导致古油藏石油裂解形成古气藏;K2—E期燕山和喜马拉雅运动形成陕北斜坡,中央隆起带天然气向斜坡高部位运移,受岩性封堵形成靖边气田。
The analysis of a large number of lithofacies shows that there are secondary filling bitumen or charcoal in the Ordovician weathering crust reservoirs in the central uplift belt Chunxian 1, Fupao 1 and Shaan-54 well, with high maturity (RO ≈2.0% ), Phototropism and biomarker characteristics are shown as oil-cracked remnants, evidence of paleo-reservoirs (fields). The paleo-oil reservoir is located in the dip direction of the Jingbian gas field, and the Middle Ordovician Pingliang Formation penolith shale in the west and southward dip strata is rich in organic matter and may be the source rock of the ancient reservoirs. The burial depth of J2-K1 and the increase of paleo-geothermal temperature resulted in the formation of paleo-gas reservoirs in the ancient oil reservoirs. The K2-E Yanshan and Himalayan movements formed the northern slope of Shaanxi and the central uplifted natural gas migrated to the high part of the slope, By the lithological seal formation of Jingbian gas field.