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柴西地区天然气具备较大的勘探潜力,然而主要生气中心、主力气源岩、天然气成藏关键时刻尚未明确,制约了天然气勘探进程。选取在含油气系统模拟中应用最广的PetroMod软件,输入相关参数,恢复剥蚀量,建立柴西地区古近系—新近系三维地质模型,运行后得到各套烃源岩成熟度平面图、生气强度图、运聚方向图以及生气量,由此可以确定主力气源岩为下干柴沟组上段(E~2_3)和上干柴沟组(N_1);指出天然气平面分布受源岩成熟度的控制,天然气位于成熟—高成熟源岩区及附近;主要生气凹陷为红狮、小梁山和茫崖东3个凹陷,围绕生气凹陷周缘的构造高部位是天然气的运聚方向;主要生气期为第四纪(Q_(1+2))和上新世晚期(N~3_2),关键时刻为N~2_2末。在以上研究的基础上,指出狮子沟—油砂山—英东—大乌斯、油泉子—开特米里克—油墩子和小梁山—南翼山—大风山构造带是下步柴西地区天然气勘探的重点领域。
Natural gas in Chaixi area has great exploration potential. However, the key time of gas accumulation and gas accumulation in main gas genera and gas source rocks and natural gas reservoirs is still not clear, restricting natural gas exploration process. The PetroMod software, which is the most widely used in oil and gas system simulation, was selected to input relevant parameters and restore the denudation volume. The Paleogene-Neogene 3D geological model was established in Qaidam Basin. After the operation, the maturity plan of each source rock was obtained, Fig.3, the direction of gas accumulation and gas generation, so that the main gas source rocks can be identified as the Upper Member (E ~ 2_3) and the Upper Ganchaigou Member (N_1) of the Lower Ganchaigou Formation. It is pointed out that the distribution of natural gas is affected by the maturity of the source rocks Controlled and the natural gas is located in and near the mature-high maturity source rock area. The main gas sags are the three red trenches such as Hongshi, Xiaoliangshan and Mangyaadong. The high tectonic positions around the periphery of the gas sag are the gas migration and accumulation directions. The main gas-generating periods are Quaternary (Q_ (1 + 2)) and late Pliocene (N ~ 3_2), the key moment is N ~ 2_2. On the basis of the above studies, it is pointed out that the structural zones of Shizigou - Youshaoshan - Yingdong - Daxi, Youquanzi - Kettering - oil piers and Xiaoliangshan - Key areas for natural gas exploration.