巴汗淖地区马五6段是近年来鄂尔多斯盆地北部奥陶系海相油气勘探关注的新层段.采用ICP-AES离子体质谱地球化学测试与成岩演化相结合的研究方法,探讨分析了巴汗淖地区马五6段风化壳型碳酸盐岩储层的主要成岩作用类型.研究结果表明,研究区碳酸盐岩的SiO2、K2 O、TiO2、P2 O5、Mn、Na含量略低,Al2 O3、Fe的含量高,Eu、Ce显负异常,说明研究区地层经历埋藏成岩作用,且后期地层抬升到地表遭受了大气淡水的淋滤;其中,白云岩的MgO值及Na的含量与灰岩的含量相比略高,这主要是埋藏白云石化作用的结果.进一步研究表明,埋藏溶解作用、埋藏白云石化作用以及表生期大气淡水淋滤作用使得次生孔隙发育,有利于油气的储集.
In recent years, the Ordovician Ma5th6 member of Majiagou Formation from Bahannao area ( northern of Ordos Basin) has becomes a new stage of oil and gas exploration concern. This study combined ICP-AES ion mass spectrumetry geochemical test with diagenetic evolution, to investigate discuss the main diagenesis types of the weathering crust carbonate reservoir of Ma5th6 member in Bahannao area. The contents of SiO2 , K2 O, TiO2 , P 2 O5 , Mn, Na from carbonate rocks were slightly lower but contents of Al2 O3 and Fe were higher. The contents of Eu and Ce show negative anomaly. The geochemical characteristics indicate that strata from Bahannao area experienced burial diageneses and suffered atmospheric fresh water leaching during the subsequent late diagenesis dut to the region uplift. The MgO and Na values of dolomite was higher than those of limestone as a result of buried dolomitization. Further study showed that burial dissolution, burial dolomitization and atmospheric fresh water leaching influenced the development of secondary pore which is advantageous to the oil and gas reservoir.
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