中国南海西沙地区西科1井中新统梅山组白云岩特征及成因

doi:10.11743/ogg20200119

Abstract

Abstract:

Cenozoic carbonate platform was well developed in South China Sea, and dolostones are quite common in carbonate sequences of Xisha Islands. The characteristics of the Miocene Meishan dolomite is described by studying the macro-and micro-scopic features of dolostones, the carbon and oxygen isotopes, and main/trace elements in Well Xike 1. Mainly four categories of dolostones were developed in the Meishan Formation in Well Xike 1, which are different in thickness, color and porosity. Sucrosic dolomites, commonly distributed under the ancient exposed surface, can be seen in thick-bedded dolostones. While thin-bedded dolostones feature loose consolidation and incomplete dolomitization.The dolomite crystals are dominated by subhedral-idiomorphic flat surfaces, and bright edge and foggy center are seen in some dolomites of very fine to fine-crystallized crystals. The carbon and oxygen isotopes of carbonate rocks in the Meishan Formation show certain correlation, while the correlation of carbon and oxygen isotopic values in the dolostones is insignificant. The paleosalinity value of dolostones is calculated to be slightly higher than that of contemporaneous seawater. The oxygen isotopic value of dolostones is positive, indicating that the dolomitization was not affected by magmatic hydrothermal fluids and organic acid solution.Most thin-bedded dolomites in the Meishan Formation are calcareous dolostones, low in Fe, Sr and Mn concentrations, suggesting that the source of magnesium ions is mainly seawater. The rare earth elements (REE) are characterized by low Ce and Eu. In conclusion, the dolomitization in the study might have been caused by seepage reflux, and is characterized by high porosity and permeability as a result of geothermal warming, implying good reservoir potential.

Key words: geochemistry, petrological characteristics, dolostone, Meishan Formation, Miocene, South China Sea

CLC Number:

TE122.2

He Yin, Yahui Wang, Juan Liu, Zhiqiang Shi, Daojun Zhang. Characteristics and origin of dolostones in the Miocene Meishan Formation in Well Xike 1, Xisha Islands, South China Sea[J]. Oil & Gas Geology, 2020, 41(1): 209-222.

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白云岩层位	件数	CaO/%	MgO/%	Sr/10^-6	TFe/10^-6	Mn/10^-6
第1套厚层	10	34.06~37.19/345.64	15.08~18.66/18.06	45.0~152.0/118.6	37.0~362.0/139.0	3.6~19.0/7.4
第2套厚层	6	33.30~39.00/34.85	14.10~19.00/16.89	139.0~226/184.5	15.0~210.0/80.3	7.1~17.0/11.5
薄层	4	33.70~36.80/34.90	18.55~18.70/17.02	90.0~159.0/140.3	19.0~210.0/92.3	9.0~16.0/13.3
第3套厚层	7	33.90~38.62/35.60	14.13~18.59/17.02	127.0~242.0/166.5	14.0~248.6/96.7	10.0~20.1/15.4

白云岩层位	件数	δ¹³C(PDB)/‰	δ¹⁸O(PDB)/‰
第1套厚层白云岩	10	2.626~3.051/2.789	2.293~4.619/3.484
第2套厚层白云岩	6	2.670~3.146/2.901	0.892~3.290/1.831
薄层白云岩	4	1.800~2.180/1.969	0.987~4.070/2.568
第3套厚层白云岩	7	2.167~2.340/2.228	2.173~3.303/2.603
灰岩	48	-4.788~2.951/0.959	-7.021~1.444/-2.110
灰质云岩	8	1.214~2.944/2.061	0.802~4.105/2.278
云质灰岩	6	1.546~2.034/1.777	-2.761~1.980/-0.339

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Characteristics and origin of dolostones in the Miocene Meishan Formation in Well Xike 1, Xisha Islands, South China Sea

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