O值无明显差别、Fecarb和Mncarb含量较高,推测其白云石化流体来源相同,为海水衍生的弱还原性孔隙水。(3)研究剖面由下至上从 Ⅰ 型共生组合到 Ⅱ 型共生组合沉积序列的垂向演化,反映了蒸发潮坪环境中共生体系的典型白云石化过程,即随着海平面上升,从S1段至S2段由潮上带准同生萨布哈白云石化演化为潮间带—潮下带渗透回流白云石化,Ⅰ 型共生组合中白云岩的MREE和Fecarb含量高于 Ⅱ 型共生组合白云岩,反映白云石化流体性质从富Fe2+-Mn2+、MREE向贫Fe2+-Mn2+、MREE的演化。研究认识丰富了共生体系下白云岩成因的基础理论,可为马家沟组油气勘探提供理论指导。"/>
Research on dolomitization process in dolomite-evaporite syngenetic system of the Majiagou Formation in Ordos Basin
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China; 2 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China; 3 Chengdu University of Technology Research Branch,Key Laboratory of Carbonate Reservoir,CNPC,Chengdu 610059,China; 4 PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China; 5 Key Laboratory of Carbonate Reservoir,CNPC,Hangzhou 310023,China
Abstract The dolomite reservoir is developed in the typical dolomite-evaporite paragenetic system(DEPS)of the Ordovician Majiagou Formation in the Ordos Basin. Many researchers have conducted numerous studies on the characteristics and formation mechanism of dolomite reservoirs in the Majiagou Formation. However,limited research has been done on the dolomitization process and evolution characteristics from the perspective of DEPS. In this study,two dolomite-evaporite sedimentary sequences(S1 and S2)from the Xiweikou section on the southeast margin of the Ordos Basin were selected for high-precision continuous sampling. Through sedimentology and petrology analysis,as well as carbon-oxygen isotopes,rare earth elements(REEs)and trace elements,two types of dolomite-evaporite paragenetic assemblages were identified. A detailed study was conducted on the properties,sources,evolution of dolomitization fluid,and the dolomitization process. The results show that: (1)in the S1 sampling interval,a Type I paragenetic assemblage is present,consisting mainly of intraclast grain dolomite-dissolved gypseous breccias dolomite-dolomicrite bearing gypsum pseudocrystals-mudstone. This indicates a supratidal environment with strong evaporation. In the S2 sampling interval,a Type II paragenetic assemblage is observed,mainly composed of thin-medium thick layers of finely crystalline dolomite-medium(grain)dolomite-argillaceous dolomite bearing gypsum pseudocrystals-mudstone,representing an intertidal-subtidal environment. (2)The REE distribution patterns of dolomite in two types of paragenetic assemblages are similar to those of pore water,both showing enrichment of MREE,with slightly negative anomalies-normal of Ce and Eu. There is no significant difference between δ13C and δ18O,and the contents of Fecarb and Mncarb are relatively high. It is speculated that the sources of dolomitized fluid are the same,originating from weakly reducing pore water derived from seawater. (3)The sedimentary sequence in the studied geological section changes from type I to type II from bottom to top,reflecting the typical dolomitization process of paragenetic systems in evaporative tidal flat environments. As sea level rose from S1 to S2,penecontemporaneous sabkha dolomitization in the supratidal zone evolved into seepage reflux dolomitization in the intertidal-subtidal zone. The concentrations of MREE and Fecarb in dolomite of the type I paragenetic assemblage are higher than those in type Ⅱ,indicating the evolution of dolomitization fluid properties from rich Fe2+-Mn2+ and MREE to poor Fe2+-Mn2+ and MREE. The research has enriched the basic theory of dolomite genesis under paragenetic systems and provides theoretical guidance for oil and gas exploration in the Majiagou Formation in the Ordos Basin.
Fund:Co-funded by the National Natural Science Foundation of China(Nos.42272133, 42102136), the Scientific Research and Technology Development Project of PetroChina (No. 2021DJ0503)
Corresponding Authors:
WEN Huaguo,born in 1979,is a professor at Chengdu University of Technology. He is engaged in the teaching and research on carbonate sedimentology. E-mail: wenhuaguo08@cdut.edu.cn.
About author: WU Yuting,born in 2000,is a master's degree candidate at Chengdu University of Technology. Her studies focus on carbonate sedimentology. E-mail: wuyuting@stu.cdut.edu.cn.
Cite this article:
WU Yuting,NING Meng,XIA Pan et al. Research on dolomitization process in dolomite-evaporite syngenetic system of the Majiagou Formation in Ordos Basin[J]. JOPC, 2024, 26(4): 895-910.
WU Yuting,NING Meng,XIA Pan et al. Research on dolomitization process in dolomite-evaporite syngenetic system of the Majiagou Formation in Ordos Basin[J]. JOPC, 2024, 26(4): 895-910.
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