论文部分内容阅读
顺南-古城地区处于在塔里木盆地顺托果勒低隆起(阿满低隆)、卡塔克隆起(塔中隆起)和古城墟隆起(古城低隆)3个构造单元的汇聚部位。近3年来,在顺南-古城地区的中-下奥陶统鹰山组或中奥陶统一间房组-中、下奥陶统鹰山组(以鹰山组为主)及其毗邻的塔中隆起塔中1号构造下寒武统肖尔布拉克组的碳酸盐岩中,已经有11口探井获得天然气流,天然气产量最高可达165.8×104m3/d(顺南5井无阻流量)和107.8×104m3/d(古城9井),显示顺南-古城地区丰富的天然气资源潜力。对顺南-古城地区以及塔中1号构造的11口探井的天然气烃类组分与稳定碳同位素组成的气-气对比表明:天然气干燥系数C1/C1-5值达0.99~1.00,属于过成熟干气范畴;天然气碳同位素组成δ13C1—δ13C4值均大于-42.5‰,与塔里木盆地台盆区不同源的典型天然气对比,确认天然气源自寒武系气源层。以顺南4井为例,采用流体包裹体测温-单井地层埋藏史数值模拟-实测地层Ro(镜质体反射率)剖面校正热史的集成技术,厘定中奥陶统一间房组-中、下奥陶统鹰山组(以鹰山组为主)气藏属于一期成藏,天然气充注时间为22~10 Ma(中新世),属于晚期成藏,有利于天然气资源的保存。
The Shunnan-Gucheng area is located at the converging site of the three structural units in the Shundegule low uplift (Aman low uplift), Khatak uplift (Taichung uplift) and the ancient city ruin uplift (Gucheng low range) in the Tarim Basin. In the past 3 years, in the middle-lower Ordovician Yingshan Formation or Ordovician Yijianfang Formation-Middle and Lower Ordovician Yingshan Formation in Shunnan-Gucheng area (mainly Yingshan Formation) and its adjacent Tazhong Uplift Among the carbonate rocks of the Lower Cambrian Shoalbulak Formation in No. 1, there are already 11 exploration wells that obtain natural gas flow with natural gas up to 165.8 × 104m3 / d (Shunnan5 Well) and 107.8 × 104m3 / d (Ancient City 9 well), showing Shunnan - ancient city rich natural gas resources potential. The comparison of gas-gas composition of natural gas components and stable carbon isotope composition of 11 exploration wells in Shunnan-Gucheng area and Tazhong No.1 shows that the natural gas drying coefficient C1 / C1-5 reaches 0.99-1.00, Mature dry gas. The δ13C1-δ13C4 values of the carbon isotopic composition of natural gas are both greater than -42.5 ‰. Comparing with the typical natural gas from different sources in the Tarim Basin, it is confirmed that the natural gas is derived from the Cambrian gas source. Taking Shunnan No.4 well as an example, this paper adopts the temperature measurement of fluid inclusions - the numerical simulation of burial history of single well strata - the integrated technology of measuring the thermal history of stratigraphic Ro (vitrinite reflectance) profile, The Middle and Lower Ordovician Yingshan Formation (mainly Yingshan Formation) belonged to the first stage of accumulation. The filling time of natural gas was 22 ~ 10 Ma (Miocene), belonging to late accumulation, which is favorable for the preservation of natural gas resources.