鄂尔多斯盆地南部地区上三叠统延长组6段地层水成因及其油气意义
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摘要
鄂尔多斯盆地南部地区延长组6段(长6段)地层水化学分析结果表明,地层水总矿化度较高,离子以Cl-、(Na++K+)和Ca2+占绝对优势,水型主要为Ca Cl2型。总矿化度主要受Cl-和(Na++K+)控制,纵向上,其随深度的增加具有递增趋势,反映深部地层水逐渐浓缩,环境封闭性增强。平面上总矿化度与砂体厚度具有较好的一致性,沉积相控制了总矿化度的分布。南部地区长6段地层水具有较小的钠氯系数、镁钙系数、脱硫系数和阳离子交换系数,较大的变质系数,表明长6段地层水整体位于交替停滞带,为封闭缺氧的还原环境,有利于油气聚集和保存。分析表明,南部地区长6段地层水为与地表水隔绝的深层封闭水,总矿化度及Ca2+浓度均与孔隙度具有一定正相关关系,结合区域热演化史,综合表明长6段地层水成因与成岩作用和有机质的热演化等有密切联系,其是经过较强浓缩变质作用并受油气等有机流体影响的原始沉积成因水。综上所述,长6段油气伴生地层水反映的盆地南部油气藏处于稳定封闭的环境下,油气勘探前景良好。
Chemical analysis of formation water in the 6 thmember of Yanchang Formation(Chang 6 member) in the southern Ordos Basin reveals that the formation water is high in total salinity; Cl-,(Na++ K+) and Ca2 +are dominant,and thus the water is of CaCl2 type. Vertically,the total salinity,mainly controlled by ions of Cl-and(Na++ K+),tends to increase with increasing depth,demonstrating the ever-condensing feature of formation water with depth and the evergrowing sealing conditions subsurface. Laterally,the distribution of the total salinity is relatively consistent with the sand body thickness,and is controlled by sedimentary facies. Given that the formation water in Chang 6 member is characterized by low sodium-chloride ratio,magnesium-calcium ratio,coefficient of desulfurization and exchange coefficient of cations,and high metamorphism coefficient in chemistry,we are sure that the formation water therein is located in alternating stagnant zones,a closed anoxic and reducing environment,which is conducive for hydrocarbon accumulation and preservation. Besides,the formation water therein belongs to the enclosed deep water isolated from the surface water,and both its total salinity and Ca2 +concentration have a certain positive correlation with porosity of Chang 6 member. Accordingly we may conclude that the origin of formation water in the area is closely related with the diagenesis and thermal evolution of organic matters,based on the regional thermal evolution history. What's more,it is original sedimentary wa-ter,having undergone strong condensation and metamorphism and been affected by organic fluids such as oil and gas. All in all,the formation water associated with oil and gas in the 6 thmember of Yanchang Formation in the southern Ordos Basin manifests that the hydrocarbon reservoirs in the southern part of the basin is in a stable and closed environment,and the prospects for its oil-gas exploration are brighter.
Chemical analysis of formation water in the 6 thmember of Yanchang Formation(Chang 6 member) in the southern Ordos Basin reveals that the formation water is high in total salinity; Cl-,(Na++ K+) and Ca2 +are dominant,and thus the water is of CaCl2 type. Vertically,the total salinity,mainly controlled by ions of Cl-and(Na++ K+),tends to increase with increasing depth,demonstrating the ever-condensing feature of formation water with depth and the evergrowing sealing conditions subsurface. Laterally,the distribution of the total salinity is relatively consistent with the sand body thickness,and is controlled by sedimentary facies. Given that the formation water in Chang 6 member is characterized by low sodium-chloride ratio,magnesium-calcium ratio,coefficient of desulfurization and exchange coefficient of cations,and high metamorphism coefficient in chemistry,we are sure that the formation water therein is located in alternating stagnant zones,a closed anoxic and reducing environment,which is conducive for hydrocarbon accumulation and preservation. Besides,the formation water therein belongs to the enclosed deep water isolated from the surface water,and both its total salinity and Ca2 +concentration have a certain positive correlation with porosity of Chang 6 member. Accordingly we may conclude that the origin of formation water in the area is closely related with the diagenesis and thermal evolution of organic matters,based on the regional thermal evolution history. What's more,it is original sedimentary wa-ter,having undergone strong condensation and metamorphism and been affected by organic fluids such as oil and gas. All in all,the formation water associated with oil and gas in the 6 thmember of Yanchang Formation in the southern Ordos Basin manifests that the hydrocarbon reservoirs in the southern part of the basin is in a stable and closed environment,and the prospects for its oil-gas exploration are brighter.
引文
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