Quantitative recovery of solid-fluid interaction and prediction of cause of secondary pores in beach and bar reservoirs in the upper part of Member 4 of Shahejie Formation of Paleogene, Dongying sag
Zhao Wei1, Qiu Longwei1, Jiang Zaixing2
1 School of Geosciences, China University of Petroleum(East China),Qingdao 266580,Shandong; 2 School of Energy Resources, China University of Geosciences(Beijing),Beijing 100038;
Abstract There are large scale of typical lacustrine beach and bar sandbodies of the upper part of the Member 4 of Shahejie Formation of Paleogene in Dongying sag and a great amount of oil and gas has been found in this area. Based on the analysis of cements and secondary pores,which are the products of the solid-fluid interaction,we can quantitatively or semi-quantitatively recover the process of the liquid changing and its effects on the porosity of reservoirs combing with the evolution of the basin and the structure development stages. Finally,in accordance with the fluid sources and time of duration, the whole evolution process can be divided into five stages,which are the reaction stage of initial liquid,the reaction stage of liquid from surrounding rocks,the reaction stage of liquid from outer sources,the reaction stage of liquid with hydrocarbon migration and the reaction stage after hydrocarbon accumulation. According to the formation mechanism of secondary pores and the zoning character of beach and bar sand bodies,we can indentify the secondary pore zones as the zone dominated by the acid fluids in gravelly beach and bar along the shore line,the zone effected commonly by the acid and alkaline fluids in the near shore bar sand bodies,and the zone dominated by the alkaline fluids in the bar far from shore and in the central resonance belt,and the speculation of secondary pores in the plane also been done in this article.
Corresponding Authors:
Zhao Wei,born in 1982,is a post-doctoral fellow in China University of Petroleum(East China). He is mainly engaged in the research of sedimentology,sequence stratigraphy and reservoir geology. E-mail: upc_wee@163.com.
Cite this article:
Zhao Wei,Qiu Longwei,Jiang Zaixing. Quantitative recovery of solid-fluid interaction and prediction of cause of secondary pores in beach and bar reservoirs in the upper part of Member 4 of Shahejie Formation of Paleogene, Dongying sag[J]. JOPC, 2016, 18(5): 769-784.
Zhao Wei,Qiu Longwei,Jiang Zaixing. Quantitative recovery of solid-fluid interaction and prediction of cause of secondary pores in beach and bar reservoirs in the upper part of Member 4 of Shahejie Formation of Paleogene, Dongying sag[J]. JOPC, 2016, 18(5): 769-784.
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