Research On The Hydrocarbon Enrichment Rules Of Lixian North Slope

Lixian north slope section is located in the west of the Raoyang sag of Jizhongdepression, and it is one of the important field of oil and gas exploration in Raoyangsag. The problems of enrichment regularity, lithologic reservoirs with low amplitudestructure to implement difficult, sandbody distribution are not clear and whichrestrict the area exploration. Aiming at these problems, this study has carried out acomprehensive study of the fracture distribution and styles, sedimentary reservoircharacteristics and hydrocarbon source rock development and distribution etc.,summarize the rule of oil and gas accumulation, the conclusions have been achievedas follows:（1）In this area mainly developed two sets of hydrocarbon source rocks of Sha1member and Sha4member to the Kongdian group. Sand period of hydrocarbonsource rocks with hydrocarbon expulsion and early ability students early, can formthe size of resource amount of immature oil, oil is the main gas source; sand sourcefour to Kongdian formation rock is minor in this area oil gas source; analysis oftectonic evolution and evolution from the configuration of the relationship source,structural traps formed earlier than the source of hydrocarbon expulsion time, trapeffectiveness is good, two is a good space-time allocation relation.（2）The three direction southwest, West, north of the source Lixian Countyslope of main target layer sand body types and distribution control,1) Lower of sha1member is a retrogradational shallow water delta front facies, the development ofthe underwater distributary channel sand, sand beach sand;2) Lower of sha2member is fluvial facies, in the slope high position is braided stream deposition,development of beach and heart beach sand slope, low position is meandering riverfacies, beach sand development. These types of sand bodies are favorable forforming lithologic traps.（3）There are three major control factors of slope in the northern part of theLixian County oil and gas enrichment,1) source control: the source trough and the sand out of effective hydrocarbon source rock distribution range control oil and gasdistribution;2) fault controlled, Titron: gather the main faults and structural noseuplift amplitude control oil and gas phase control:3); the north section of slope ofsand body in front zone, sand than moderate, sandstone lens development, controlthe lithologic and structural lithologic reservoirs, control the scale of.（4）Three accumulation model are builed in Lixian slope north section isbuilded:1) from the source vertical migration accumulation pattern;2) lateral stepaccumulation model;3) it is the source of vertical fault migration accumulationmodel.（5）Lixian slope BoShi Zhuang-Yanling tectonic belt, Xiliu area and GaoYang-the same port area is the favorable zones of exploration in the future. In2014BoShi Zhuang-Yanling tectonic belt drilling Bo6, Dian43two wells were accessedto oil flow, showing a good exploration prospect in this area.