川东地区中二叠统茅口组白云岩储层成因机理及主控因素

doi:10.11764/j.issn.1672-1926.2021.04.014

Abstract

Abstract:

Based on outcrop and core data， a large number of thin section， scanning electron microscope， major element， trace element， rare earth element and strontium isotope analysis data， the formation mechanism of dolomite reservoir of Maokou Formation in eastern Sichuan was analyzed， and three new understandings were obtained：（1） According to the grain structure and occurrence， the dolomite can be further divided into three categories： matrix mosaic dolomite， which is relatively far from the tectonic hydrothermal veins. The matrix "mist core and bright edge" dolomite is mostly associated with the tectonic hydrothermal veins. The structural fracture dolomite is mainly distributed in the tensional tectonic fractures and pores formed by hydrothermal fracture， and is half-filled.（2）The dolomite has undergone two stages of hydrothermal dolomitization. The matrix mosaic dolomite was formed under syndepositional and shallow buried conditions， and the "mist core bright edge" dolomite was formed on the basis of early dolomitization and later hydrothermal reformation. The tectonic fracture dolomites were formed by hydrothermal fluid precipitation.（3）The shoal was the basis of dolomite development， and the basement faults were synsedimentary fault and the migration channels of hydrothermal fluids， which was the key to the formation of dolomite. The south side of the 15^# base fault is the preferred target area for dolomite exploration， which provides reference for the Maokou Formation in Sichuan Basin.

Key words: Dolomite reservoir, Genetic mechanism, Maokou Formation, Eastern Sichuan Basin

CLC Number:

TE122.1

Rangbin LI, Jinbao DUAN, Lei PAN, Hong LI. Genetic mechanism and main controlling factors of the Middle Permian Maokou Formation dolomite reservoirs in the eastern Sichuan Basin[J].Natural Gas Geoscience, 2021, 32(9): 1347-1357.

Figures/Tables 9

Fig.1

Fig.2

Fig.3

Table 1

Major element characteristics of different types of dolomite in Maokou Formation, eastern Sichuan Basin"

剖面/井	样品点	结构	P₂O₅	SO₃	CaO	TiO₂	MgO	SiO₂	SrO	Al₂O₃	MnO	FeO	NiO	Total
回龙场剖面	HLC-C-89-001	镶嵌状	0	0.071	32.18	0.002 5	21.127	0	0	0.001 7	0.004	0.002	0	53.422
	HLC-C-89-002		0	0	32.14	0	21.854	0.022	0.051	0.381	0.055	0	0	54.501
	HLC-C-89-003		0.013	0.042	32.39	0	21.47	0.017	0	0.551	0.057	0	0.004	54.542
	HLC-C-89-004		0	0.033	32.91	0.037	22.292	0	0.014	0.019	0.057	0.008	0.002	55.373
	HLC-C-89-005		0.06	0.024	33.57	0	21.06	0	0.011	0.027	0.051	0	0	54.806
	HLC-C-89-006		0.013	0.038	32.67	0	21.855	0	0.011	0.019	0.032	0	0	54.633
	HLC-C-89-007		0	0.005	32.29	0.002	22.124	0.04	0.021	0.02	0.032	0	0	54.536
	HLC-C-89-008		0.067	0.038	32.98	0.002	21.872	0	0	0.039	0.025	0.014	0.033	55.074
	HLC-C-89-009		0.067	0.033	30.82	0	20.955	0.013	0.023	0.17	0.008	0	0	52.089
二崖剖面	ERY2-D-151-014	亮边	0.033	0	32.782	0.004	21.33	0.007	0.004	0.02	0.017	0.006	0	54.203
	ERY2-D-151-015	亮边	0.053	0	32.859	0	21.052	0.011	0.009	0.173	0.011	0	0	54.168
	ERY2-D-151-016	雾心	0	0	33.045	0	21.498	0	0	0.036	0.021	0.004	0	54.604
	ERY2-D-151-017		0	0	32.716	0.015	21.265	0.002	0.035	0.016	0	0.008	0	54.057
	ERY2-D-151-018		0	0.009	32.333	0.002	21.665	0.02	0.012	0.038	0.036	0	0.004	54.119
	ERY2-D-151-019		0.02	0.066	33.076	0.021	21.346	0.019	0.039	0.042	0.017	0.054	0.01	54.71
	ERY2-D-151-020	亮边	0.04	0.033	33.092	0	21.288	0	0.016	0.014	0.03	0	0	54.513
	ERY2-D-151-021		0.013	0.005	31.99	0.019	21.749	0.027	0.007	0.05	0.023	0	0	53.883
	ERY2-D-151-022		0	0.019	32.574	0.002	21.574	0	0	0.027	0.027	0.01	0	54.233
	ERY2-D-151-023		0.02	0.028	32.187	0	21.817	0	0.025	0.069	0.019	0	0.012	54.177
	ERY2-D-151-024		0.007	0.005	33.009	0	21.551	0.013	0.041	0.023	0.025	0.025	0.023	54.722
	ERY2-D-151-025		0.054	0.042	32.405	0	21.27	0	0	0.034	0.025	0.002	0.015	53.847
	ERY2-D-151-026		0.027	0	32.496	0.044	21.638	0.033	0.011	0.026	0.034	0.014	0.027	54.35
	ERY2-D-151-027		0	0.019	32.387	0.004	21.369	0.008	0	0.031	0.017	0.012	0.048	53.895
	ERY2-D-151-028		0.033	0.005	33.515	0	21.554	0.012	0.012	0.031	0	0	0	55.162
TL6井	TL6-11-C-016	脉体	0.066	0.072	28.248	0	21.461	0.073	0.036	0.071	0.06	0.039	0.021	50.147
	TL6-11-C-017		0.033	0	29.783	0.046	21.154	0.01	0.005	0	0.056	0.051	0.026	51.164
	TL6-11-C-018		0.013	0	29.596	0	21.524	0.025	0.007	0	0	0	0	51.265
	TL6-11-C-019		0	0	28.971	0.012	21.67	0.01	0	0	0.009	0.255	0.015	50.933
	TL6-11-C-020		0	0	29.129	0	21.429	0.019	0	0	0.049	0.233	0.006	50.865
	TL6-11-C-021		0.007	0.014	29.244	0	21.799	0	0	0	0	0.153	0	51.217
	TL6-11-C-022		0.02	0	29.478	0.017	21.983	0	0	0.011	0	0	0	51.509
	TL6-11-C-023		0.033	0	29.024	0	21.98	0	0	0	0.071	0.149	0	51.257
	TL6-11-C-024		0	0	29.132	0	22.179	0.013	0	0	0.019	0.178	0.021	51.542
	TL6-11-C-025		0.073	0	28.998	0	21.882	0.025	0.034	0.037	0.013	0.041	0.008	51.111
	TL6-18-C-010	镶嵌状	0.04	0	61.637	0	0.35	0	0.185	0	0	0	0.01	52.552
	TL6-18-C-011		0.048	0.065	31.922	0.013	22.649	0.087	0.06	0.043	0	0.032	0	54.919
	TL6-18-C-012		0.042	0.009	31.393	0.011	22.068	0.024	0.028	0.02	0.027	0.055	0	53.677
	TL6-18-C-013		0.066	0.009	31.693	0	22.012	0.18	0	0.014	0	0.043	0.022	54.039
	TL6-18-C-014		0.048	0.061	32.177	0	22.214	0.01	0	0.041	0.047	0.018	0	54.616
	TL6-18-C-015		0.006	0.044	31.995	0	22.099	0.01	0.013	0.037	0.014	0	0	54.218
	TL6-18-C-016		0.03	0	31.739	0.006	21.536	0.039	0	0.018	0.029	0	0.021	53.418
	TL6-18-C-017		0.055	0.071	32.086	0	22.598	0.054	0	0.052	0.03	0.054	0	55
	TL6-18-C-018		0	0.067	31.478	0	21.748	0.033	0.017	0.01	0.026	0.076	0	53.455
	TL6-18-C-019		0.018	0.004	32.23	0	22.856	0.053	0.02	0.03	0	0.027	0	55.238
	TL6-18-C-020		0.049	0.053	31.347	0	21.564	0.027	0.017	0.038	0.049	0.002	0.007	53.153

Table 1

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

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Genetic mechanism and main controlling factors of the Middle Permian Maokou Formation dolomite reservoirs in the eastern Sichuan Basin

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