Main Controlling Factors of Effective Reservoir in the Second
Section of Bayingebi of Chagan Sag

doi:10.11885/j.issn.1674-5086.2013.12.17.03

Abstract

Abstract:

Chagan Sag is a Mesozoic sedimentary sag，the second section of Bayingebi is the main hydrocarbon generation
interval. Fan delta surrounds the sag，and the fan delta sedimentary is of coarse granularity，fast phase change and poor physical
property. The main controlling factors of hydrocarbon accumulation are effective reservoir. Based on the studies of precipitation
facies，diagenesis，reservoir prediction about the mechanism of effective reservoir generation and distribution，we understand
that physical properties of different facies of fan delta are largely different，and plain subfacies is of high content of glutenin of
matrix，poor sorting and reservoir density；outside frontal subfacies is of thin rock granularity，weak hydrodynamic，high shale
content and poor reservoir physical property；in front distributary channel microfacies is fine microconglomerate and gritstone
of fine sorting and low shale content. Calcium cementation compaction plays an inhibitory effect in the early diagenesis，which
creates the conditions for later dissolution，and Alkaline sedimentary environment and diagenetic evolution of sedimentary are
helpful to form dissolution pores. In Chagan Sag，hydrocarbon accumulation has the characteristics of oil and gas storing in
frontal fan delta–plain block–close range migration in the store–the tectonic setting control. Based on the above understanding，
we focus on the anatomy of the Wuliji structure zone，and make a breakthrough of the thin oil exploration in the fan delta front.

Key words: Chagan Sag, fan delta, dissolution pore, seismic facies, reservoir prediction

Zhang Fangdong1, Wang Xuejun1, Rao Lei1, Zhou Yan1, Liu Qingwei2. Main Controlling Factors of Effective Reservoir in the Second
Section of Bayingebi of Chagan Sag[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.12.17.03.

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