皖南泾县地区下三叠统殷坑组晏公堂剖面三维数字露头表征及油气地质意义

doi:10.13809/j.cnki.cn32-1825/te.2022.01.014

Abstract

Abstract:

The oil and gas exploration of the Early Triassic Yinkeng Formation with wide distribution in the Jingxian County of the southern Anhui is relatively lagging. Based on the outcrop, well core and test analysis data, the depositional characteristics, hydrocarbon generation conditions and reservoir conditions of the Yinkeng Formation in southern Anhui are discussed. Using the “UAV stereo photography”, an innovative digital survey of the outcrop can be carried out to extract structural and sedimentary information. Combined with the artificial geology survey and the section digitization of the outcrop, the Yinkeng Formation can be divided into 16 sub-layers. The lithological of Yinkeng Formation is generally consist of gray mud limestone, conglomerate limestone and conglomerate limestone, with black and black gray mudstone. The cumulative thickness of the Yinkeng Formation is 43.8 meters with the TOC content ranging from 0.38 % to 2.21 % and the vitrinite reflectance ranging from 0.95 % to 1.21 %, indicating that the shales of the Yinkeng Formation is good source rocks and has a hydrocarbon potential. The porosity and permeability of limestones in the Yinkeng Formation range from 0.928 % to 2.626 %, and 0.12×10^-3 μm² to 3.22×10^-3 μm², respectively. The limestone intervals have under-developed matrix pores and low permeability, but have developed micro-fractures. Therefore, slopes and open shelf are favorable sedimentary facies with “self-generation and self-storage” petroleum system, and the Yinkeng Formation has large hydrocarbon potential.

Key words: sedimentary facies, hydrocarbon potential, Yinkeng Formation, southern Anhui, Jingxian County

CLC Number:

TE121

ZHOU Lei,FENG Xingqiang,BAO Shujing,TAN Yuanlong,WU Lin,ZHANG Linyan. 3D digital outcrop characterization and significance of petroleum geology of the early Triassic Yinkeng Formation Section in Jingxian County of southern Anhui[J].Reservoir Evaluation and Development, 2022, 12(1): 160-170.

Figures/Tables 13

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Table 1

Measured results from Yangongtang section in Lower Triassic Yinkeng Formation"

地层		小层	层厚 (m)	岩性描述	含化石	采样及测试
统	组	小层	层厚 (m)	岩性描述	含化石	采样及测试
下三叠统	和龙山组	18	13.6	浅灰色薄层灰岩,含铁质结核
	殷坑组	17	18.5	上部为黑色页岩夹浅灰色薄层灰岩,下部为浅灰色薄至中厚层灰岩夹灰黑色页岩	含瓣鳃类：Claraia sp.
		16	21.8	黑灰色泥页岩夹薄层灰岩	含瓣鳃类：Posidonia sp.; 菊石：Gyrophiceras sp.,Koninckites sp.,Parakymatites sp.	泥页岩样品YGT-12,有机地球化学测试分析
		15	3.7	灰色中厚层灰岩和黑色泥页岩互层		泥页岩样品YGT-11,有机地球化学测试分析
		14	9.2	浅灰中厚层—厚层色砾屑灰岩、角砾灰岩,夹黑色页岩	含瓣鳃类：Posidonia sp.,Entolum sp.
		13	15.2	黑色页岩夹中厚层灰岩	含瓣鳃类：Claraia sp.,Posidonia sp.	泥页岩样品YGT-07、YGT-08、YGT-09、YGT-10,有机地球化学测试分析
		12	21.8	灰色、浅灰色厚层角砾灰岩,夹黑色泥页岩		灰岩样品YGT-05、YGT-06,铸体薄片,孔隙度和渗透率物性测试
		11	7.6	浅灰色、灰色薄层—中厚层灰岩与灰黑色页岩互层	含菊石：Gyronites sp.,Gyrophiceras sp.,Prionolobus sp.,Gyrolecanites sp.;含瓣鳃类：Eumorphotis sp.	泥页岩样品YGT-04,有机地球化学测试分析
		10	9.5	灰色厚层角砾灰岩夹中厚层灰岩
		9	4.7	浅灰色中厚层灰岩夹薄层灰岩
		8	5.3	深灰色薄层灰岩和中厚层灰岩互层		灰岩样品YGT-02,铸体薄片,孔隙度和渗透率物性测试
		7	3.0	深灰色薄层—中厚层灰岩夹黑色页岩,局部含同生角砾	含菊石：Gyronitidae
		6	3.0	灰色厚层角砾灰岩
		5	31.1	灰色薄—中层砾屑灰岩		灰岩样品YGT-01,铸体薄片,孔隙度和渗透率物性测试
		4	2.5	灰色薄层灰岩夹黑色页岩	含菊石：Meekoceras sp.瓣鳃类：Claraia cf. griesbachi	页岩样品YGT-03,有机地球化学测试分析
		3	0.7	灰色中厚层灰岩
		2	2.4	灰黑色泥页岩
上二叠统	大隆组	1	11.9	灰黑色硅质页岩夹泥页岩

Table 1

Fig. 5

Table 2

Fig. 6

Table 3

Fig. 7

Fig. 8

Fig. 9

Fig. 10

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样品	岩石热解						镜质体反射率(%)
样品	S₁(mg/g)	S₂(mg/g)	T_max (℃)	S₁+S₂(mg/g)	TOC(%)	氢指数(mg/g)	minR_o	maxR_o	meaR_o
TGY-03	0.14	0.54	435	0.68	0.45	119	0.97	1.14	1.08
TGY-04	0.14	0.56	434	0.70	0.53	105	0.92	1.12	1.07
TGY-07	0.27	1.84	440	2.11	1.07	172	0.91	1.23	0.95
TGY-08	1.06	3.18	444	4.24	2.21	144	1.11	1.30	1.21
TGY-09	0.21	0.84	440	1.05	0.61	138	0.94	1.21	1.18
TGY-10	0.31	1.44	437	1.75	1.02	141	0.78	1.26	1.12
TGY-11	0.06	0.50	442	0.56	0.58	87	1.05	1.35	1.21
TGY-12	0.06	0.31	444	0.37	0.38	82	0.93	1.23	1.17

样品	高压压汞				核磁共振
样品	φ_MIP (%)	k (10^-3μm²)	p₅₀ （MPa）	r₅₀ (μm)	φ_NMR (%)	峰型（个）
TGY-01	1.988	0.48	151.48	0.005	1.97	2
TGY-02	0.928	3.22	84.25	0.009	0.93	2
TGY-05	1.108	0.32	161.37	0.005	1.06	2
TGY-06	2.626	0.12	39.66	0.019	2.41	2

3D digital outcrop characterization and significance of petroleum geology of the early Triassic Yinkeng Formation Section in Jingxian County of southern Anhui

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