羌塘盆地南坳陷中侏罗统布曲组白云岩储层成因流体同位素地球化学示踪

doi:10.11743/ogg20200117

Abstract

Abstract:

This paper presents study on the properties and evolution of genetic fluids in the dolomite reservoir of the Buqu Formation in the southern depression of Qiangtang Basin. Petrological classification is performed on the dolomite and genetic fluids tracing is carried out through isotopic analysis of carbon, oxygen, and strontium (C, O, Sr) in carbonate minerals of various ages. The results show that:(1) the Buqu dolomite in the study area experienced multiple-stage superimposed modification by dolomitization fluids, the genetic fluids of dolomite and crystalline-grained dolomite with original structure of precursor limestone are contemporaneous seawater. The isotopic (C, O, Sr) composition has a certain inheritance to the precursor limestone. (2) With the increase of burial depth, the crystalline structure of dolomite changed gradually. The oxygen-isotope (δ¹⁸O_PDB) gradually became more negative:from micro-fine-crystalline dolomite (-3.81‰), to fine-crystalline and automorphic dolomite (-4.34‰), to fine-crystalline and hypautomorphic dolomite (-6.10‰), and to medium-to-coarse-crystalline and xenomorphic dolomite (-7.36‰). (3) Genetic fluids of saddle-shaped dolomite is meteoric water which flows through the underlying clastic formations into the Buqu Formation. The primary heat source was related to tectonic hydrothermal events and lasts 78-64 Ma. (4) Fine-to-medium-crystalline and automorphic dolomite cements, intercrystalline dolomite pore-filled calcites may have been developed at the end of shallow burial stage. The genetic fluid is contemporaneous seawater. The bright calcite veins are developed after the saddle-shaped dolomite, and its genetic fluid may be meteoric water related with the uplifting of Qinghai-Tibet Plateau. The superposition of multi-stage dolomitization fluids, meteoric water leaching and dissolution affected the formation and distribution of dolomite reservoirs in the Buqu Formation, and further controlled the quality of dolomite reservoirs herein.

Key words: isotopic geochemistry, genetic fluid, dolomite reservoir, Buqu Formation, Qiangtang Basin

CLC Number:

TE122.2

Youli Wan, Jian Wang, Xiugen Fu, Dong Wang. Geochemical tracing of isotopic fluid of dolomite reservoir in the Middle Jurassic Buqu Formation in southern depression of Qiangtang Basin[J]. Oil & Gas Geology, 2020, 41(1): 189-200.

Figures/Tables 5

Fig.1

Fig.2

Table 1

The C, O and Sr isotopic values of each type of the Buqu dolomites from Well QZ12 in southern depression of Qiangtang Basin"

样品编号	深度/m	岩石类型	δ¹³C(PDB)/‰	δ¹⁸O(PDB)/‰	⁸⁷Sr/⁸⁶Sr
16D-13	75.22	泥晶灰岩	1.19	-8.25	0.707 765
16D-20	130.83	泥晶灰岩	1.96	-8.62	0.707 763
16D-21	131.46	亮晶砂屑灰岩	2.57	-7.47	0.707 850
16D-07	58.24	微粉晶白云岩	3.74	-4.22	0.707 747
16D-14	96.21	纹层状白云岩	3.42	-3.84	0.708 176
16D-25	198.13	微粉晶白云岩	4.23	-3.37	0.707 654
16D-06	57.31	细晶、自形白云石	4.11	-4.56	0.707 525
16D-15	100.63	细晶、自形白云石	3.64	-4.33	0.707 667
16D-17	102.02	细晶、自形白云石	3.18	-4.23	0.707 572
16D-22	143.12	细晶、自形白云石	3.33	-4.25	0.708 037
16D-23	151.71	细晶、自形白云石	3.83	-4.31	0.707 686
16D-02	26.57	细晶、半自形白云石	4.42	-5.87	0.707 432
16D-03	30.24	细晶、半自形白云石	4.18	-6.26	0.707 609
16D-05	43.43	细晶、半自形白云石	3.95	-6.23	0.707 990
16D-16	101.12	细晶、半自形白云石	3.28	-5.56	0.707 780
16D-24	190.37	细晶、半自形白云石	2.72	-6.57	0.707 593
16D-01	24.29	中-粗晶、它形白云石	3.24	-7.22	0.707 303
16D-04	43.43	中-粗晶、它形白云石	4.05	-7.65	0.707 884
16D-10	67.73	中-粗晶、它形白云石	3.92	-8.22	0.707 752
16D-12	72.73	中-粗晶、它形白云石	3.85	-6.56	0.707 234
16D-18	107.14	中-粗晶、它形白云石	4.14	-8.16	0.707 593
16D-27	581.62	中-粗晶、它形白云石	3.68	-6.37	0.707 865
16D-19	122.84	细-中晶、自形白云石胶结物	3.02	-5.31	0.708 147
16D-08	60.65	鞍形白云石胶结物	-0.09	-10.41	0.708 518
16D-09	60.64	鞍形白云石胶结物	3.38	-9.58	0.708 876
16D-11	69.33	鞍形白云石胶结物	1.27	-9.25	0.708 562
16D-26	580.95	鞍形白云石胶结物	1.86	-8.56	0.708 180
14QZ12-026	105.02	白云石晶间孔中充填的方解石	3.73	-5.38	0.708 128
14QZ12-001-1	232.16	裂缝第二期充填肉红色方解石脉	-1.15	-13.04
14QX12-001-2	232.16	裂缝充填第三期白色粗-巨晶方解石	-0.85	-11.97
14QZ12-005	219.76	裂缝充填第二期肉红色方解石脉	-1.35	-11.33
14QZ12-007	219.81	裂缝充填第一期白色方解石脉	0.57	-10.62
14QZ12-013	195.75	裂缝充填第三期白色粗-巨晶方解石	1.89	-10.45
14QZ12-029	75.32	裂缝充填第一期白色方解石脉	-1.18	-9.42
14QZ12-030	70.96	裂缝充填第一期白色方解石脉	1.64	-10.75

Table 1

Fig.3

Fig.4

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Geochemical tracing of isotopic fluid of dolomite reservoir in the Middle Jurassic Buqu Formation in southern depression of Qiangtang Basin

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