Characteristics, control factors and development models of Permian tight sandstone reservoirs in Huanghua depression, Bohai Bay Basin

doi:10.3969/j.issn.1672-7703.2019.04.011

Abstract

Abstract: In order to study the formation and distribution of the dominant Permian reservoirs in Huanghua depression, geological data (including drilling, geological logging, well logging and seismic) were investigated based on actual drilled cores and sidewall cores, and the characteristics and controlling factors of the tight Permian reservoirs were analyzed in the study. It is concluded that the formation and distribution of the dominant Permian reservoirs are controlled by Indo-Chinese palaeo-structures; the Permian rocks are mainly arkose and quartz sandstone; and the reservoir space is composed of secondary intergranular and intragranular dissolution pores, moldic pores and fractures. The low-porosity and extra-low-permeability reservoirs can be classified into porous and fractured reservoirs, and their distribution depends on the Indo-Chinese palaeo-structures. The buried hill in the Qikou sag is located in the Indo-Chinese palaeo-uplift area where the palaeo-uplift and its slope have been denuded intensively, so that it is easy to develop porous reservoirs. The buried hill in the Cangdong sag had been influenced by strong Indo-Chinese thrust nappe activities, so that fractures are developed, and it is possible to form fractured reservoirs.

CLC Number:

Han Guomeng, Wu Xuesong, Cui Yu, Fu Lixin, Li Hongjun, Wang Hui, Duan Runmei, Guo Shuwen, Lou Da, Diao Liying. Characteristics, control factors and development models of Permian tight sandstone reservoirs in Huanghua depression, Bohai Bay Basin[J]. China Petroleum Exploration, 2019, 24(4): 509-519.

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