Analysis on Geochemical Characteristics and Difference of Formation Water in He 8th Member in Northern and Southern Tianhuan Depression
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摘要:
通过对鄂尔多斯盆地天环坳陷中二叠统下石盒子组盒8段地层水样品测试结果的统计分析，分别对区内南北部的地球化学特征进行研究，对比其差异性，分析天然气运聚和保存条件，为勘探部署提供支持。研究显示，天环坳陷中二叠统下石盒子组盒8段为偏酸性、氯化钙型地层水，区内矿化度、Cl－含量和浓度都显示为北高南低，反映了北部铁克苏庙地区地层水封闭条件优于南部青石峁–李庄子区域，更有利于气藏的聚集和保存。南北部地层水地化特征参数与气藏形成条件有较好的对应性。北部地区为Ⅳ型、Ⅴ型原始地层水，地层水的钠氯系数低、脱硫系数低、钠钙系数低、变质系数高，具有油气伴生水的特征，地层封闭性较好，利于气藏的聚集和保存；而南部地区为Ⅱ型、Ⅲ型、Ⅳ型地层水，显示较差的封闭条件，地层水与外界有沟通，不利于气藏的运聚和保存。
Abstract:Based on the statistics and analysis of the test results of formation water samples of He 8th Member of Tianhuan depression, Ordos basin, the geochemical characteristics of the northern and southern parts of the area are studied, and the differences were compared. The results show that the formation water of He 8th member of Tianhuan Depression is acidic and CaCl2 water type, and the mineralization degree, Cl− content and concentration in the area are higher in the north than in the south. It reflects that the sealing condition of formation water in the Tiekesumiao area in the north is better than that in Qingshimao - Lizhuangzi area in the south, which is more conducive to the accumulation and preservation of gas reservoirs. The Geo-chemical characteristic parameters of formation water in the north and south have good correspondence with the formation conditions of the gas reservoir. The formation water in the northern area is characterized by low sodium-chloride coefficient, low desulfurization coefficient, low sodium-calcium coefficient and high metamorphic coefficient. The formation water is of Ⅳ-type and Ⅴ-type original formation water, which is favorable for the accumulation and preservation of gas reservoirs. In the southern area, the formation water of Ⅱ-type, Ⅲ-type and Ⅳ-type shows poor sealing conditions, and the formation water communicates with the outside world, which is not conducive to the accumulation and preservation of gas reservoirs.
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Key words:
- formation water /
- geochemical characteristics /
- difference /
- He 8th Member /
- Tianhuan depression
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表 1 研究区下石盒子组（P2x）盒8段南北部地层水主要化学离子含量
Table 1. Content of main chemical ions in formation water in the northern and southern part in He 8th Member of Xiashihezi Formation (P2x) in the study area
地区 主要离子含量（mg/L） 矿化度（mg/L） K++Na+ Ca2+ Mg2+ Cl− SO42− HCO3− 铁克苏庙 
青石峁–李庄子 
注：表中数据格式为 
。
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表 2 研究区下石盒子组（P2x）盒8段地层水地球化学参数及分类
Table 2. Formation water geochemical parameters and classification of He 8th member of Xiashihezi formation in the study area
地区 钠氯系数
r（Na+）/r（Cl−）脱硫系数
2×100×r（SO42−）/r（Cl−）钠钙系数
r（Na+）/r（Ca2+）变质系数
1/2×r（Cl−）-r（Na+）/r（Mg2+）水型 铁克苏庙 
CaCl2 青石峁-李庄子 
CaCl2 注：表中数据格式为 
。
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表 3 博亚尔斯基对氯化钙型地层水的详细分类
Table 3. Classification of the calcium chloride type water
序号 Na/Cl 水型 石油地质意义 1 ＞0.85 Ⅰ 表现出水的运动速度相当大的水动力活跃的特点，这个地带保存条件差，保存油气藏的前景不大 2 0.75～0.85 Ⅱ 具有沉积盆地的积极水动力带和较稳定的静水带之间过渡带的特点，一般认为是烃类保存条件较差的地区 3 0.65～0.75 Ⅲ 水动力条件平缓，有利于保存油气，认为是保存烃类较好的有利环境 4 0.50～0.65 Ⅳ 具有烃类聚集与外界隔绝；并且有残余水存在的特点是烃类保存的有利地带。 5 ＜0.50 Ⅴ 具有古代残余海水的特点，在溶解固体的的浓度和溶解组分的比率上，在原始沉积时就被高度变质。这是烃类聚集最有希望的区域。需具备的附加条件有：①碘化物>1 mg/L；②溴化物>300 mg/L；③Cl−/Br＜350；④SO42−×100/Cl−＜1
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