四川盆地西部雷口坡组非热液成因鞍形白云石的发现及意义

doi:10.11743/ogg20200115

Abstract

Abstract:

Since saddle-shaped dolomites are usually formed by hydrothermal fluid, multiple scholars have considered the saddle-shaped dolomite in the Leikoupo Formation, Western Sichuan Basin, as hydrothermal origin and ascribed the reservoir therein as a product of hydrothermal process. The study made an in-depth analysis of the petrology and geochemistry of saddle-shaped dolomite in the area, in order to further identify the origin of the dolomite and the genetic mechanism of the dolomite reservoir. Two origin types of saddle-shaped dolomite were identified-the hydrothermal saddle-shaped dolomite and the non-hydrothermal one. The former developed inside tectonic fractures emits bright orange red light or is non-luminant under cathodoluminescence, featuring relatively high content of δ¹⁸O and Sr-K-Fe-Mn elements, rich rare-earth elements, and negative-Eu abnormality. It's quite different from the matrix rocks, and may be a product of post-magmatic hydrothermal processes following intermediate to acidic magma activities in depth. However, the latter is a product of the dolomitization of medium-to-deep fluids inside the dolomite reservoir. Its saddle-shaped dolomite plaques in limestone and the saddle-shaped dolomite precipitates in dissolved pores or cavities in dolomite emit rose-bengal light under cathodoluminescence, featuring relatively lower content of δ¹⁸O and Sr-K-Fe-Mn elements, as well as deficiency in rare-earth element and Eu abnormality. They are quite similar to the surrounding dolomites, indicating that dolomitization fluids and substance have originated from within the same reservoir. The fact of limited distribution of the saddle-shaped dolomite of hydrothermal origin and wide distribution of the saddle-shaped. dolomite of non-hydrothermal origin in the Leikoupo Formation, indicates that the Leikoupo reservoir is not of hydrothermal origin. The relatively subdued activities of formation and hydrothermal fluids in burial have led to good preservation of effective reservoir space.

Key words: non-hydrothermal origin, reserving significance, saddle-shaped dolomite, Leikoupo Formation, Western Sichuan Basin

CLC Number:

TE122.2

Guorong Li, Zhengzhong Liu, Zixiao Xie, Yongmin Duan, Sai He, Meizhou Deng, Yuchen Wang, Yong Li, Zhangzhi Wu. Discovery of non-hydrothermal saddle-shaped dolomite in Leikoupo Formation, Western Sichuan Basin and its significance[J]. Oil & Gas Geology, 2020, 41(1): 164-176.

Figures/Tables 12

Fig.1

Fig.2

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Table 1

Statistics on the analysis of carbon and oxygen stable isotopes of the dolomite in the Leikoupo Formation, Western Sichuan Basin"

序号	井号	层位	产状描述	δ¹³C(PDB)/‰	δ¹⁸O(PDB)/‰	备注
1	羊深1	雷四下储层段	微晶云岩	2.21	0.72	微晶白云石
2	羊深1	雷四下储层段	粉-微晶云岩	2.61	-1.63	微晶白云石
3	新深1	雷四段	微晶云岩	2.65	-0.64	微晶白云石
4	龙深1	雷三段	微晶云岩	0.11	-0.89	微晶白云石
5	孝深1	雷四上储层段	微晶云岩	0.94	0.22	微晶白云石
6	孝深1	雷四上储层段	微晶云岩	0.65	0.19	微晶白云石
7	孝深1	雷四上储层段	微晶云岩	1.89	-1.05	微晶白云石
8	彭州103	雷四上储层段	粉-微晶云岩	1.02	-0.31	微晶白云石
9	彭州115	雷四上储层段	粉-微晶云岩	1.96	0.44	微晶白云石
10	彭州115	雷四上储层段	粉-微晶云岩	1.64	0.51	微晶白云石
11	彭州115	雷四上储层段	粉-微晶云岩	1.83	0.17	微晶白云石
12	邑深1	雷四上储层段	微晶云岩	1.57	-0.18	微晶白云石
13	羊深1	雷四下储层段	粉-细晶自形白云石呈层	1.56	-5.74	粉-细晶自形白云石
14	鸭深1	雷四下储层段	粉-细晶自形白云石密集	2.39	-6.94	粉-细晶自形白云石
15	鸭深1	雷四上储层段	微-粉晶自形白云石呈层	1.96	-6.86	粉-细晶自形白云石
16	彭州1	雷四上储层段	交代成因鞍形白云石斑块	2.57	-5.52	交代成因鞍形白云石
17	鸭深1	雷四下储层段	交代成因鞍形白云石斑块	-1.33	-6.53	交代成因鞍形白云石
18	彭州103	雷四下储层段	交代成因鞍形白云石斑块	1.30	-7.87	交代成因鞍形白云石
19	羊深1	雷四下储层段	孔洞内鞍形白云石	0.34	-5.22	溶蚀孔洞内鞍形白云石
20	彭州1	雷四下储层段	孔洞内鞍形白云石	2.57	-5.28	溶蚀孔洞内鞍形白云石
21	鸭深1	雷四下储层段	缝洞内鞍形白云石	-0.52	-7.56	溶蚀孔洞内鞍形白云石
22	鸭深1	雷四下储层段	孔洞内鞍形白云石	-0.62	-6.41	溶蚀孔洞内鞍形白云石
23	鸭深1	雷四下储层段	孔洞内鞍形白云石	-0.72	-6.65	溶蚀孔洞内鞍形白云石
24	鸭深1	雷四下储层段	孔洞内鞍形白云石	-0.71	-7.50	溶蚀孔洞内鞍形白云石
25	新深1	雷四段	构造裂缝内脏鞍形白云石	2.69	-1.97	构造裂缝内鞍形白云石
26	彭州115	雷四段	构造裂缝内鞍形白云石	1.45	-3.91	构造裂缝内鞍形白云石
27	龙深1	雷三段	构造裂缝内脏鞍形白云石	1.53	-4.06	构造裂缝内鞍形白云石
28	龙深1	雷三段	构造裂缝内脏鞍形白云石	1.51	-4.21	构造裂缝内鞍形白云石
29	龙深1	雷三段	构造裂缝内脏鞍形白云石	0.42	-5.24	构造裂缝内鞍形白云石
30	龙深1	雷三段	构造裂缝内脏鞍形白云石	0.53	-4.23	构造裂缝内鞍形白云石
31	龙深1	雷三段	构造裂缝内脏鞍形白云石	0.57	-5.35	构造裂缝内鞍形白云石
32	龙深1	雷三段	构造裂缝内脏鞍形白云石	0.38	-4.58	构造裂缝内鞍形白云石

Table 1

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Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

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Discovery of non-hydrothermal saddle-shaped dolomite in Leikoupo Formation, Western Sichuan Basin and its significance

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