Sedimentary characteristics of saltrocks and their petroleum geologic significance of the Member 3 of Shahejie Formation of Paleogene in Dongpu Sag，Henan Province
Du Haifeng1, Yu Xinghe1, Chen Faliang2
1 School of Energy Resources, China University of Geosciences(Beijing)，Beijing 100083 2 Geophysical Research Institute of Zhongyuan Oilfield Company, SINOPEC，Puyang 457001，Henan
Abstract：Dongpu Sag is located in the southwestern Bohai Bay rift basin. It is a part of the Linqing Depression. In contrast with other sags in the Bohai Bay rift basin，the Dongpu Sag has a remarkable feature that the sag is a prolific salty sag. There are three sets of salt beds in the Member 3 of Shahejie Formation of Paleogene in the central uplift and its vicinity in northern Dongpu Sag. Each set of salt beds consists of numerous salt cyclothems that are composed of salt rock and mudstone. The concentrated salt area is the main productive fairway in the Dongpu Sag. There is an intimate relationship between salt beds and oil gas enrichment. By analyzing the cores，logs，and seismic data，the authors sum up the lithologic，electric and seismic characteristics of the saltrocks. The evolutionary regular pattern of saltrock lithology is from sandstone and mudstone through gypseous mudstone，gypsum halite，halite，gypsum mudstone，to sandstone and mudstones. Electric characteristics are represented by very low density，very low natural gamma，very high electric resistivity，and expanded hole diameter in fresh water drilling mud. Seismic response are characterized by high amplitude and low frequency. Based on studies of development characteristics of the saltrocks，saltrock distribution pattern is known. At the same time the authors study the relationship between saltrocks and source rock，reservoir and cap rock，and rank the source-reservoir-seal assemblages. Ten types of the assemblages are identified. Based on this，the authors sum up the hydrocarbon accumulation. The study results define the significance of the saltrocks for petroleum geology. It is important for rolling exploration for mature oilfields.
Du Haifeng,Yu Xinghe,Chen Faliang. Sedimentary characteristics of saltrocks and their petroleum geologic significance of the Member 3 of Shahejie Formation of Paleogene in Dongpu Sag，Henan Province[J]. JOPC, 2008, 10(1): 53-62.
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