梁平福禄镇剖面大安寨段泥页岩地质特征

doi:10.13809/j.cnki.cn32-1825/te.2022.01.012

Abstract

Abstract:

The lacustrine mud shale in Jurassic of Sichuan Basin is characterized by fast sedimentary phase transition, complex and diverse lithological combination types, and strong reservoir inhomogeneity, which is quite different from the marine shale. Therefore, it is of great significance to establish a typical geological section of Jurassic lacustrine shale in Sichuan Basin and further study the microfacies and lithologic assemblage characteristics of lacustrine shale. The Da'anzhai section of Fulu Town, Liangping District, Chongqing, Eastern Sichuan is selected as the research object. Through the division of small layers, fine description of sedimentary microfacies and lithologic combination characteristics, sample collection, field profile measurement, organic geochemistry, reservoir physical properties and whole rock X-ray diffraction, it is shown that the Da'anzhai section of Fulu town is mainly carbonate lake sediments. The microfacies and lithologic assemblages have three stages: initial transgression, maximum transgression and initial regression. The first and third members of the Da'anzhai formation are mainly composed of the microfacies of the thick layer mesoclastic limestone deposited in the bioclastic beaches of the carbonate shallow lake; The second member of Da'anzhai formation is a semi deep lacustrine subfacies. There are two microfacies: Storm beach and semi deep lacustrine mud. They are characterized by two lithologic associations, i.e. unequal thickness interbedding of grey clastic limestone and grey black shale, and thick black shale with thin shell limestone, With high content of brittle minerals and better permeability and compressibility, it is a sweet spot for shale oil and gas enrichment. Compared with the typical shale gas drilling, The semi deep lacustrine facies of the second member is mainly distributed in Fuling Jiannan area in eastern Sichuan, which is conducive to the formation of shale oil and gas. The carbonate shallow lacustrine clastic shoals of the first and third members are mainly distributed in Central Sichuan Northeast Sichuan, which is conducive to the enrichment of tight oil and gas.

Key words: lithological association, continental shale, shale oil and gas, Da'anzhai section, Fulu Town section, Sichuan Basin

CLC Number:

TE122

Tong ZHU,Zhe ZHANG,Dongjun FENG, et al. Geological characteristics of mud shale in Da'anzhai section of Fulu Town, Liangping[J]. Reservoir Evaluation and Development, 2022, 12(1): 139-149.

Figures/Tables 9

Fig. 1

Table 1

Layered data of Da'anzhai section in Fulu Town"

分层号	地层名称	岩性描述	样品号	导线号	倾向λ （?）	倾角α（?）	方位角Φ（?）	坡度角β （?）	分层厚度（m）	累计厚度（m）
30	凉高山组	灰绿色厚层块状细砂岩		9	161	49	178	2	2.90	109.88
29	过渡层	灰黑色泥岩夹灰绿色细砂岩		8	161	49	178	2	2.60	106.98
28	大三段	震积角砾岩		8	161	49	178	2	2.30	104.38
27		灰黑色微晶灰岩	F-42	8	161	49	178	2	5.42	102.08
26		灰色介屑灰岩夹黑色泥岩	F-41	8	169	36	130	2	3.64	96.66
25		灰色微晶介屑灰岩夹灰黑色泥岩	F-40	7	171	38	130	2	2.16	93.02
24		灰色介屑灰岩与泥岩互层	F-39	7	171	38	130	2	1.02	90.86
23		灰色微晶介屑灰岩	F-38	7	171	38	130	2	0.62	89.84
22		灰褐色微晶灰岩夹灰黑色页岩	F-37	7	171	38	130	2	1.37	89.22
21		灰黑色泥岩夹粉晶灰岩	F-36	7	160	23	156	1	2.25	87.85
20		灰色粉晶介屑灰岩	F-34、35	7	155	23	156	1	1.40	85.60
19	大二段	灰黑色泥岩夹微晶灰岩	F-32、33	6	150	29	156	1	6.12	84.20
18		灰色微晶灰岩	F-31	6	158	26	156	1	0.63	78.08
17		灰色泥岩与介壳灰岩互层		6	158	26	156	1	3.07	77.45
16		灰色泥岩夹介屑灰岩	F-30	6	158	26	156	1	4.26	74.38
15		黑色泥岩与介壳灰岩互层	F-28、29	6	158	27	156	1	2.65	70.12
14		黑色泥岩夹薄层灰岩	F-27	6	168	34	156	1	1.70	67.47
13		灰色介屑粉晶灰岩	F-25、26	6	170	24	156	1	1.36	65.77
12		灰黑色泥岩夹介壳灰岩	F-23、24	6	163	21	156	1	3.90	64.41
11		灰色介壳灰岩	F-22	6	140	24	156	1	1.12	60.51
10		黑色页岩夹薄层介壳灰岩	F-18、19、20、21	6	158	36	188	2	24.12	59.39
9		灰黑色页岩夹介壳灰岩	F-17下、中、上	6	140	24	188	2	9.18	35.27
8		灰色介壳灰岩与灰黑色页岩互层	F-12、13、14、15、16	5	158	35	188	2	3.15	26.09
7		灰色介屑灰岩夹薄层泥岩	F-9、10、11	5	170	22	237	2	3.27	22.94
6		黑色泥岩	F-6、7、8	3-4	192	23	237	2	3.51	19.67
5	大一段	灰色介屑灰岩	F-5	2	150	14	237	2	1.93	16.16
4		灰黑色泥岩夹薄层灰岩	F-4	1	150	14	237	2	2.87	14.23
3		灰黑色泥岩		1	150	14	222	2	2.05	11.36
2		灰色亮晶介屑灰岩	F-3	1	194	14	222	2	2.18	9.31
1		灰褐色介屑灰岩夹泥岩	F-2	1	198	14	222	2	4.03	7.13
0	马鞍山段	灰绿色粉砂岩	F-1	0	155	13	222	2	3.10	3.10

Table 1

Fig. 2

Fig. 3

Table 2

Fig. 4

Fig. 5

Table 3

Fig. 6

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		大一、三亚段	大二亚段
沉积相特征	亚相类型	浅湖	半深湖
	微相类型	高能介屑滩	湖坡风暴滩	半深湖泥
	水动能条件	强	较强	弱
	沉积构造	块状	纹层状	页理状
	泥地比（%）	16~38	56~64	88
	岩性组合	厚层介屑灰岩	泥页岩与介屑灰岩不等厚互层	厚层页岩夹薄层介壳灰岩
	宏观剖面特征
	微观特征
烃源特征	TOC（%）	0.1~1.1,平均0.6	0.3~1.7,平均1.2
储层特征	孔隙度（%）	0.8~3.1,平均2.2	0.7~2.8,平均1.9
	孔隙类型	晶间孔和溶蚀孔	黏土矿物线状孔为主、溶蚀孔	黏土矿物线状孔隙为主
	裂缝发育类型	构造裂缝较发育	纹理缝、粒缘缝发育	页理缝较发育
可压性	黏土矿物（%）	10~21,平均15	24~41,平均31	38~58,平均45
	硅质（%）	11~30,平均19	19~29,平均26	27~45,平均35
	钙质（%）	40~75,平均58	20~47,平均36	8~24,平均14
	脆性指数	平均0.8	平均0.6	平均0.45

Geological characteristics of mud shale in Da'anzhai section of Fulu Town, Liangping

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样号	岩性描述	TOC （%）	黏土矿物（%）	石英、长石（%）	碳酸盐矿物（%）	其他矿物（%）
FL-01	强风化灰褐色泥岩	0.20	53	34	13	0
FL-02	介屑灰岩	0.17	16	36	48	0
FL-03	亮晶介屑灰岩	0.07	3	1	95	1
FL-04	灰黑色泥岩	0.11	28	19	52	1
FL-05	介屑灰岩	0.09	7	9	55	29
FL-06	深灰色页岩
FL-07	深灰色页岩	0.65	43	29	26	2
FL-08	亮晶介屑灰岩	0.18	4	2	94	0
FL-09	灰色页岩	0.24	36	41	22	1
FL-10	灰色页岩	0.36	50	24	24	2
FL-11	介屑灰岩	0.05	6	1	93	0
FL-12	灰黑色页岩	0.55	53	29	15	3
FL-13	深灰色页岩	0.86	55	31	12	2
FL-14	介屑灰岩	0.33	4	7	86	3
FL-15	深灰色页岩	1.08	38	19	39	4
FL-16	深灰色页岩	0.59	48	38	13	1
FL-17上	介壳灰岩	0.10	8	4	86	2
FL-17中	深灰色页岩	0.89	53	26	16	5
FL-17下	介壳灰岩	0.11	6	1	93	0
FL-18	深灰色页岩	1.36	56	33	7	4
FL-19	灰黑色页岩	0.69	55	28	15	2
FL-20	灰黑色页岩	0.82	51	27	21	1
FL-21	灰褐色介壳灰岩	0.16	4	12	81	3
FL-22	深灰色页岩	0.99	52	26	19	3
FL-23	深灰色页岩	1.58	61	29	6	4
FL-24	深灰色页岩	1.59	59	33	6	2
FL-25	深灰色页岩	0.94	52	29	17	2
FL-26	介壳灰岩	1.32	40	32	26	2
FL-27	深灰色页岩	0.83	43	48	7	2
FL-28	深灰色页岩	0.71	45	37	16	2
FL-29	深灰色页岩	0.91	62	30	5	3
FL-30	介壳灰岩	0.20	13	4	82	1
FL-31	灰色介壳灰岩	0.18	12	2	86	0
FL-32	灰色页岩	0.92	57	35	6	2
FL-33	灰色页岩	0.99	58	26	13	3
FL-34	介壳灰岩	0.32	12	3	83	2
FL-35	灰黑色页岩	1.02	64	28	4	4
FL-36	介壳灰岩	0.24	10	4	81	5
FL-37	介屑灰岩	0.31	6	3	88	3
FL-38	灰黑色页岩	1.15	66	25	5	4
FL-39	介屑灰岩	0.12	4	2	93	1
FL-40	介屑灰岩	0.03	5	1	93	1
FL-41	介屑灰岩	0.04	5	1	93	1

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