大巴山北缘下寒武统页岩沉积特征及有利相带分析——以紫阳毛坝剖面为例

doi:10.13809/j.cnki.cn32-1825/te.2022.01.009

Abstract

Abstract:

The drilling of Lower Cambrian shale gas in the northern margin of Mount Daba shows good prospect. A set of dark shale strata are generally developed in the lower Cambrian in this area, but the stratigraphic heterogeneity is strong, and the sedimentary facies change obviously in the region. It is helpful for the further exploration and development to the study shale sedimentary characteristics of the Lower Cambrian in this area and analyze its influence on the differential enrichment of organic matter. On the basis of outcrop section in Maoba of Ziyang and experimental data, the researches are carried out from three aspects: the division and correlation of sedimentary facies, the analysis of sedimentary mode and the analysis of favorable sedimentary facies zones. The Lower Cambrian in the study area can be divided into four sedimentary subfacies: sub abyssal rifting trough basin facies, deep water shelf facies, shallow water shelf facies, and platform edge slope facies. Longitudinally, the water body changes from deep to shallow, and the contents of carbonaceous and siliceous gradually decrease, while the contents of clayey and carbonate gradually increase. The dark mud shale developed in the lower Cambrian Lujiaping Formation deep water shelf facies in Langao-Zhenping stratigraphic district has the larger thickness and higher content of total organic carbon and brittle minerals, which is a favorable sedimentary facies belt for the development of high-quality shale.

Key words: northern margin of Mount Daba, Lower Cambrian, sedimentary mode, shale gas, differential enrichment

CLC Number:

TE122

Ye ZHANG,Chuan YU,Zhiping ZHANG, et al. Sedimentary characteristics and favorable facies of Lower Cambrian Shale in the northern margin of Mount Daba: A case study of Maoba Outcrop in Ziyang[J]. Reservoir Evaluation and Development, 2022, 12(1): 107-118.

Figures/Tables 8

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Table 1

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References 24

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沉积相类型	主要沉积岩性	发育厚度（m）	有机碳（%）	成熟度（%）	孔隙度（%）	渗透率（10^-3μm²）	脆性矿物（%）	黏土矿物（%）
次深海裂陷槽盆	深灰—灰黑色含碳硅质页岩夹灰质白云岩	28~110	0.8~1.5	2.5~4.1	0.5~1.2	0.002~0..008	70~85	7~15
深水陆棚	黑色碳质页岩夹硅质岩	130~290	2.2~9.6	2.4~3.9	0.7~1.9	0.002~0.015	50~63	10~26
浅水陆棚	深灰—灰黑色含碳粉砂质页岩	158~360	0.5~1.8	2.1~4.0	0.8~1.6	0.003~0.010	32~53	15~33
台地边缘	灰色灰质页岩、泥灰岩	112~195	0.2~0.7	2.2~3.8	0.6~2.1	0.003~0.016	25~41	14~35

Sedimentary characteristics and favorable facies of Lower Cambrian Shale in the northern margin of Mount Daba: A case study of Maoba Outcrop in Ziyang

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