Structural Evolution And Oil-gas Accumulation Analysis Of Buried Hill In The South Slop Of Dongying Sag, Bohaiwan Basin

Dongying sag, which lies in the south of Jiyang depression of bohaiwan basin, is a very important oil-gas field. Though little progress has been made in the deep buried hill exploration since it was explored., industry oil was found in wanggul bore of the buried hill for the frist time in the year 2003. So,it is realized that knowing the oil distribution law of the buried hill is very useful for oil exploration. The key problem is to analysis and know buried hill structural evolution history in these areas, and furthe more to study the relaship between the buried hill structural characteristic and oil accumulation.Combined with geology dada, utilization seismic line, and based on balanced section theory, this dissertation studies the structural evolution of Dongying sag, Wangjiagang and Chunhua buried hill structureal characteristic and its oil accumulation law, finally it gets the following achievements1. Dongying sag underwent Indosinian movement, Yanmshannian movement and Himalayan tectonic mainly. The buried hill forming process can be divided into the following 5 phase: (1) The Paleozoic stable uplift phase; (2) the Triassic to early-middle Jurassic fold uplift phase; (3) the late Jurassic -cretaceous fault depression phase in the outset ;(4) the early genozoic rift-expension phase; (5) the late genozoic whole sag phase;2. The buried hill play of Dongying sag is mainly located in south/north and west edge. There are Chunhua-Caoqiao-Guangrao-Bamianhe lower paleozoic buried hill in the southern slop;There are Zhenjia-Wangzhuang lower Paleozoic and Archaeozonic buried hill; In the west step slop ,there exists Shangdian-Pingnan-Gaoqing lower Paleozonic and Mesozoic buried hill. In Dongying sag, there are some distribution law of different genetic buried hill , which mainly locate in horseback/slop /step slop and so on of the pretertiary second structural unit.3.Wanggu 1 buried hill is the inside fold-faulted hill. It experiences muti-compressional and muti-extensional phase and come into being , with very complicated inside structural form, ,from Paleozoic to Genozoic. In the compressional phase of Indosinian movement, it become a hill, and followed is reformated by the fault ,which formed during Yanshanian movement and Himalayan movement. According to its structural characteristics and evolution history, the overthrust nappe of Wanggu 1 buried hill is explained as fault propagation fold.4.The source rock of Wanggul buried hill is the kongdianzu2 formation.The migration path-way is fault of west and unconformity of north in the buried hill. The main factor that affects accumulation is the quality of reservoir. The fissure , formed during Indosinian movment and Yanshannian movement, is an important element in reconvering the reservoir.5.Chunhua buried hill is the fault-hill, which lies in the footwall of Shicun fault. The...