There are two main groups of hydrocarbon source rocks in southwest Dongpu Sag,the Carboniferous-Permian and the third member of Shahejie Formation.Their hydrocarbon generation capacity and their contribution to hydrocarbon accumulation affect the evaluation of the exploration strata and targets in this area,especially since there have been differing opinions regarding whether the third member of the Shahejie Formation can produce gas,and whether the gas reservoirs are mixed-source.By using geochemical methods,such as carbon isotopes,rare gas isotopes,natural gas compositions,and chromatography-mass spectrometry,oil and gas sources were compared and the geochemical characteristics of the source rocks were studied.The study shows that the organic matter in the source rocks of the third member of Shahejie Formation are dominated by Type Ⅱ2 to Type Ⅲ Kerogen with high abundance and are poor-moderate grade source rocks,while the organic matter in the Carboniferous-Permian source rocks are dominated by Type Ⅲ Kerogen with high abundance and are good quality source rocks.The crude oil in the area comes from the third member of Shahejie Formation,where the source rocks are characterized by generating oil first and then entering a high-maturity stage to produce coal-type gas with heavy carbon isotopes.The Carboniferous-Permian source rocks mainly produce coal-formed gas.These two types of gas mix and become important natural gas sources in the area.The two groups of hydrocarbon source rocks are the most favorable exploration sources in this area.

Since 2006,great achievements in EP have been made for Jurassic Shaximiao Formation gas reservoir,which plays an important role in reserves and output increment.The paper summarizes the basic geological characteristics,indicates the main problems existing in EP and advances a set of matching technologies.At present,although we have obtained some recognition of Jiaxiangzhai sandstones,we should do a comprehensive research on sandstone distribution and sedimentary facies,strengthen technology innovation and actively search for novel processes and techniques in order to lower the EP cost.

结合现场注水井套管腐蚀特点,从静态挂片和闭塞区腐蚀动态实验两方面,研究了造成套管内腐蚀严重的因素,结果表明:油田注入水的pH值对套管的全面腐蚀有极大的影响,提高pH值,虽能降低均匀腐蚀速度,但易引起套管的孔蚀和缝隙腐蚀,故pH值最高不得超过8.5.