黄骅坳陷孔西潜山下古生界原生油

EARLY PALAEOZOIC PRIMARY OIL OF KONGXI BURIED HILL IN HUANGHUA DEPRESSION, HUABEI,CHINA

华北地区经历过晚奥陶世至泥企纪长达130Ma的沉积间断，分布于该地区的稳定而厚度很大的下古生界碳酸盐岩能否二次生烃，形成下古生界自生自储的原生油气藏，是有关华北地区下古生界油气勘探前景的重大问题。位于黄骅坳陷孔店背斜构造带西北的孔古3井于奥陶系峰峰组的灰岩中产出工业性油气流，原油特征及精细油源对比研究表明，其油源岩为奥陶系灰岩，为古生古储型原生油藏。孔古3井奥陶系原生油及烃源岩二次生烃的研究成果，对于坚定寻找华北地区古生界原生油气藏的信心具有重大意义。

Huabei area suffered a sedimentary interruption of about 130 million years during Late Ordovician to Devonian period.Therefore, whether the Early Palaeozoic carbonate rocks with a stable distribution and a large thickness can secondarilygenerate hydrocarbon and form primary oil and gas pool is an important issue regarding the prospecting for primary oil and gaspools in the Lower Palaeozoic formations. Well Konggu 3, located in the northwestern Kongdian anticlinal structural belt,produced oil from the primary Ordovician limestone oil pool reserved in the Ordovician Fengfeng Porrnation' The crude oilcharacteristics and oil-source correlation show that oil source rocks are Ordovician limestone. So it is a primary oil Pool withsource and reservoir rocks in the same formation. The studies on the secondary hydrocarbon generation of source rocks andthe primary oil of Well Konggu 3 have a great significance to firmly prospect for Lower Palaeozoic primary oil and gas Pools inHuabei area.