湖相页岩油地层岩相组合类型划分及其油气勘探意义——以博兴洼陷沙河街组为例

doi:10.13809/j.cnki.cn32-1825/te.2023.01.005

Abstract

Abstract:

In order to realize the efficient development of lacustrine organic-rich shale oil reservoir in the lower sub-member of the third member of the Eocene Shahejie Formation and the upper sub-member of the fourth member of the Eocene Shahejie Formation in the Boxing Sag, Dongying depression, the geological data, such as thin sections, X-ray diffraction and the content of major and trace elements are analyzed. After the data analysis, the types of lithofacies and the evolution stage of sedimentary paleoenvironment are determined, and eight lithofacies assemblages are also divided based on the relationship between lithofacies and sedimentary environments. Then, the favorable lithofacies for shale oil exploration and development are determined based on the comparison of geological and engineering “sweet spot” parameters of different lithofacies assemblages. The results indicate that: ① Six lithofacies types of organic-rich laminated argillaceous limestone and limestone mudstone, organic-rich layered argillaceous limestone and limestone mudstone, organic-poor massive argillaceous limestone and calcareous mudstone are mainly developed in the study area; ② The sedimentary paleoenvironment with the characteristics of paleoclimate from arid to humid, little change in paleoredox, paleosalinity from high to low, and paleo-provenance from less to more exhibited eight evolutionary stages, corresponding to eight lithofacies assemblage types; ③ Lithofacies assemblage D and F, with high shale oil productivity, are the favorable in the Es^3L and Es^4U, respectively, and are in good agreement with the production practices. On the plane, the former is mainly distributed in the F159-F156-F160 well areas, and the latter is mainly distributed in FYP1-F116-F119 and F156-F159-F161 well area, which is a shale oil enrichment and high yield area in Boxing sag.

Key words: lacustrine shale oil, sedimentary paleoenvironment, types of lithofacies assemblages, plane distribution, Boxing Sag

CLC Number:

TE121

LIN Zhongkai,ZHANG Shaolong,LI Chuanhua,WANG Min,YAN Jianping,CAI Jingong,GENG Bin,HU Qinhong. Types of shale lithofacies assemblage and its significance for shale oil exploration: A case study of Shahejie Formation in Boxing Sag[J].Reservoir Evaluation and Development, 2023, 13(1): 39-51.

Figures/Tables 12

Fig. 1

Fig. 2

Table 1

Some element test data of mud shale samples in Es3L and Es4U of Boxing Sag"

层位	主微量元素
层位	Al（%）	Na（%）	Ca（%）	Sr（μg/g）	Ba（μg/g）	V（μg/g）
沙三下	$2.53 ~ 8.91 5.09$	$0.21 ~ 1.71 0.49$	$1.38 ~ 29.63 15.50$	$261.4 ~ 3 ? 486.0 1 ? 075.36$	$223.2 ~ 934.9 508.20$	$20.0 ~ 168.3 78.32$
沙四上纯上亚段	$1.08 ~ 8.33 4.25$	$0.18 ~ 2.25 0.58$	$1.52 ~ 37.75 19.81$	$309.6 ~ 4 ? 281.0 1 ? 769.65$	$58.1 ~ 1 ? 171.0 433.07$	$4.7 ~ 198.9 73.54$
沙三下+ 沙四上纯上亚段	$1.08 ~ 8.94 4.78$	$0.18 ~ 2.25 0.54$	$1.38 ~ 37.75 17.29$	$261.4 ~ 4 ? 281.0 1 ? 380.48$	$58.1 ~ 1 ? 171.0 476.73$	$4.7 ~ 198.9 76.30$

Table 1

Fig. 3

Fig. 4

Table 2

Table 3

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

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沉积古环境	判断指标	参考文献
古气候	Na/Al：高值指示干冷，低值指示温暖 CIA：高值反映温暖，低值反映干冷	[22] [23]
古氧化还原	V/Cr：高值指示还原 U/Th：高值指示还原	[24] [25]
古盐度	Sr/Ba：高值代表高盐度	[26] [27]
古物源	Al：高值代表多物源 Ti：高值代表多物源	[28]

沉积古环境段	岩相组合类型	岩心TOC （%）	沉积古环境指标均值
			古气候		古氧化还原		古盐度	古物源
			Na/Al	CIA	U/Th	V/Cr	Sr/Ba	Al（%）	Ti（%）
VIII	H	2.615	0.083	71.390	0.686	1.110	2.290	5.510	0.287
VII	G	2.451	0.083	70.663	0.738	1.002	3.548	4.420	0.210
VI	F	3.497	0.119	67.788	0.785	1.172	3.759	5.272	0.311
V	E	2.265	0.111	68.877	0.752	1.163	4.983	4.522	0.218
IV	D	2.258	0.113	67.884	0.685	1.184	5.122	4.732	0.240
III	C	2.083	0.132	65.463	0.906	1.241	7.112	2.757	0.138
II	B	2.251	0.156	63.801	0.911	1.402	5.694	4.859	0.321
I	A	2.021	0.180	60.558	0.994	11.576	6.223	3.630	0.178

Types of shale lithofacies assemblage and its significance for shale oil exploration: A case study of Shahejie Formation in Boxing Sag

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