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准噶尔盆地陆西地区火山岩孔隙中充填的碳酸盐岩对储集层物性产生巨大影响,通过对碳酸盐充填物的氧碳稳定同位素分析表明,δ13C和δ18O值均较轻且Z值较低,反映其形成于淡水环境,碳酸盐结晶温度大致分3种情况:早成岩作用阶段早期占大多数,部分形成于表生风化淋滤阶段,个别形成于热液作用阶段。通过氧同位素与古地温间的关系,推测碳酸盐充填物的结晶时间大致为晚三叠世到早侏罗世。烃源岩低成熟至成熟早期,靠近生烃凹陷的低凸带上,受淡水淋滤作用,火山岩中仍然存在部分未被碳酸盐岩充填的气孔。烃源岩大量排烃期,靠近凹陷区受溶蚀作用较强,可能存在相对优质的火山岩储集层发育区。
The carbonate rocks filled in the volcanic pores of the Luxi area in the Junggar Basin have a great influence on the physical properties of the reservoirs. Through the Oxy Carbon stable isotopic analysis of carbonate fillings, δ13C and δ18O values are both lighter and the Z values are lower , Reflecting the formation of freshwater environment, the carbonate crystallization temperature roughly divided into three kinds of situations: the early stage of early diagenesis accounted for the majority of the early stage, part of the formation of surface weathering leaching stage, the individual formed in hydrothermal stage. According to the relationship between oxygen isotope and Paleogeography, it is presumed that the crystallization time of carbonate filling is about Late Triassic to Early Jurassic. The source rock is low-mature to early mature, is close to the low-lying belts of hydrocarbon-generating depressions and is leached by freshwater. Some of the pores in the volcanic rocks that are not filled with carbonate rocks are still present. Hydrocarbon source rocks have a large amount of hydrocarbon expulsion period, which is strongly corroded near the depression, and there may be relatively high-quality volcanic reservoir development zones.