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首页> 外文期刊>Petroleum exploration and development >Geochemical characteristics and origin of dolomite: A case study from the middle assemblage of Ordovician Majiagou Formation Member 5 of the west of Jingbian Gas Field, Ordos Basin, North China
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Geochemical characteristics and origin of dolomite: A case study from the middle assemblage of Ordovician Majiagou Formation Member 5 of the west of Jingbian Gas Field, Ordos Basin, North China

机译：白云岩的地球化学特征与成因：以华北鄂尔多斯盆地靖边气田西5号奥陶系马家沟组中组合为例

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摘要

The trace elements, rare earth elements (REE), carbon and oxygen isotopic compositions and strontium isotopes were analyzed to study systematically the geochemical characteristics and origin of the middle assemblage dolomites from the Ordovician Majiagou Formation Member 5 in the Jingxi area (the west of Jingbian Gas Field), Ordos Basin. The analytical results of samples demonstrate that the MgO and CaO contents of the middle assemblage dolomite are negatively correlated, and the Mg/Ca values are high; the dolomites are characterized by high Fe content, relatively high Mn content and low Sr and Na content, while part dolomites have low Fe and Mn content but high Na content; the dolomites have very low REE content and similar REE distribution patterns, which are generally characterized by enrichment of light REE, losses of heavy REE, obviously negative anomaly of Eu and weak negative anomaly of Ce; Theδ13C values of dolomites are consistent with those of the coeval seawater, while most of theδ18O values of dolomites are more negative than those of the coeval seawater; most of the87Sr/86Sr values of dolomites are significantly higher than those of the coeval seawater while only a few are close to those of the coeval seawater. Combined with the geological setting and geochemical characteristics of the middle assemblage dolomites, the middle assemblage dolomites of the Majiagou Member 5 are probably the origin of seepage reflux dolomitization, and were superimposed by burial dolomitization during the burial period. The eastern part of the Jingxi area is favorable reservoir development area, the favorable area can extend eastward.
机译：对微量元素，稀土元素（REE），碳氧同位素组成和锶同位素进行了分析，系统地研究了靖西地区（靖边以西）奥陶纪马家沟组五段中组合白云岩的地球化学特征和成因。气田），鄂尔多斯盆地。样品的分析结果表明，中组合白云岩的MgO和CaO含量呈负相关，且Mg / Ca值较高。白云岩的特征是Fe含量高，Mn含量相对较高，Sr和Na含量较低，部分白云岩Fe和Mn含量较低，Na含量较高。白云岩的稀土元素含量很低，并且具有相似的稀土元素分布规律，其特征是轻质稀土元素富集，重稀土元素流失，Eu明显为负异常和铈弱为负异常。白云岩的δ13C值与同期海水的值一致，而白云岩的大部分δ18O值比同期海水的值更负。白云岩的大多数87Sr / 86Sr值均明显高于同期海水，而只有少数几个接近于同期海水。结合中组合白云岩的地质环境和地球化学特征，马家沟五段中组合白云岩很可能是渗流白云石化的起源，在埋藏时期被埋藏白云石化所叠加。靖西地区东部为有利储层开发区，有利区可向东延伸。

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