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Resource potential of the Jurassic gas system, northern margin of the Qaidam Basin, northwestern China
AAPG Bulletin ( IF 3.5 ) Pub Date : 2021-05-12 , DOI: 10.1306/10262018089 Zeqing Guo , Zengye Xie , Jian Li , Jixian Tian , Xu Zeng , Wei Ma
AAPG Bulletin ( IF 3.5 ) Pub Date : 2021-05-12 , DOI: 10.1306/10262018089 Zeqing Guo , Zengye Xie , Jian Li , Jixian Tian , Xu Zeng , Wei Ma
The main source rocks, hydrocarbon generative subbasins, hydrocarbon generation periods, resource potential, and the relationship between the trap evolution history and hydrocarbon generation history are important problems associated with oil and gas exploration. In this study, we develop a three-dimensional geological model with respect to the Mesozoic and Cenozoic strata of the northern margin of the Qaidam Basin based on the most recent geological data. Using this model, the burial depth, temperature, maturity, and gas generation history of the source rock, the plane diagram of the source-rock current maturity, the gas generation intensity map, and the amount of gas generation during each geological period and within different subbasins can be obtained. Based on the obtained maps, we can state that the maturity of the source rock controls the distribution of natural gas (i.e., natural gas is located within and in the vicinity of mature and highly mature source rocks). We also observed the following: (1) the Lower Jurassic section is the main gas source rock; (2) the Yibei subbasin is the main hydrocarbon generative subbasin, followed by the Kunteyi, Pingdong, and Lenghu subbasins; (3) the main gas generation period is after the upper member of the lower Ganchaigou Formation deposition, with maximum gas generation occurring during the upper Ganchaigou Formation deposition and gradually decreasing thereafter—the majority of the structures in the inner basin are formed after lower Youshashan Formation deposition, demonstrating the tectonic activity coincided with periods of natural gas formation; and (4) the amount of natural gas resource becomes 1.23 trillion cubic meters. From these analyses, we can demonstrate that the late tectonic belts formed in the four gas-generating subbasins exhibit considerable promise for exploration.
中文翻译:
柴达木盆地北缘侏罗系天然气系统的资源潜力
主要烃源岩,生烃盆地,生烃期,资源潜力以及圈闭演化历史与生烃历史之间的关系是油气勘探相关的重要问题。在这项研究中,我们根据最新的地质数据,针对柴达木盆地北缘的中生代和新生代地层建立了三维地质模型。使用该模型,可以了解每个岩石时期和内部的源岩的埋藏深度,温度,成熟度和生气历史,源岩电流成熟度的平面图,产气强度图以及产气量可以获得不同的子盆地。根据获得的地图,我们可以说源岩的成熟度控制着天然气的分布(即天然气位于成熟和高度成熟的源岩之内和附近)。我们还观察到以下情况:(1)下侏罗纪剖面是主要的气源岩;(2)宜北子盆地是主要的生烃盆地,其次是昆特伊,平东和冷湖子盆地。(3)主气成藏期在下柴cha沟组沉积上部之后,在上柴cha沟组上部沉积发生最大气体,之后逐渐减少—内陆盆地的大部分构造是在下沙山后形成的。地层沉积,表明构造活动与天然气形成时期相吻合;(4)天然气资源量为1.23万亿立方米。从这些分析中,我们可以证明在四个产气盆地中形成的晚期构造带显示出可观的勘探前景。
更新日期:2021-05-14
中文翻译:
柴达木盆地北缘侏罗系天然气系统的资源潜力
主要烃源岩,生烃盆地,生烃期,资源潜力以及圈闭演化历史与生烃历史之间的关系是油气勘探相关的重要问题。在这项研究中,我们根据最新的地质数据,针对柴达木盆地北缘的中生代和新生代地层建立了三维地质模型。使用该模型,可以了解每个岩石时期和内部的源岩的埋藏深度,温度,成熟度和生气历史,源岩电流成熟度的平面图,产气强度图以及产气量可以获得不同的子盆地。根据获得的地图,我们可以说源岩的成熟度控制着天然气的分布(即天然气位于成熟和高度成熟的源岩之内和附近)。我们还观察到以下情况:(1)下侏罗纪剖面是主要的气源岩;(2)宜北子盆地是主要的生烃盆地,其次是昆特伊,平东和冷湖子盆地。(3)主气成藏期在下柴cha沟组沉积上部之后,在上柴cha沟组上部沉积发生最大气体,之后逐渐减少—内陆盆地的大部分构造是在下沙山后形成的。地层沉积,表明构造活动与天然气形成时期相吻合;(4)天然气资源量为1.23万亿立方米。从这些分析中,我们可以证明在四个产气盆地中形成的晚期构造带显示出可观的勘探前景。