An examination of the fluid inclusions of the well RP3-1 at the Halahatang Sag in Tarim Basin, northwest China: Implications for hydrocarbon charging time and fluid evolution
An examination of the fluid inclusions of the well RP3-1 at the Halahatang Sag in Tarim Basin, northwest China: Implications for hydrocarbon charging time and fluid evolution
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DOI：
10.1016/j.petrol.2016.04.038
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发表时间：
2016-10-01
影响因子：
--
通讯作者：
Cao, Wei
中科院分区：
文献类型：
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作者：
Ni, Zhi-Yong;Wang, Tie-Guan;Cao, Wei
RP 3 -1井位于中国西北部新疆维吾尔自治区南部的塔里木盆地。该地区是世界上最大的边疆盆地之一。我们在RP 3 -1井收集的钻井资料揭示了一个2398-7066 m厚的沉积序列，包含奥陶纪至第三纪地层。中奥陶统一间房组（O（2）yj）是该区最重要的储集层之一。O（2）yj组主要由生物碎屑和内碎屑灰岩组成。两种不同的流体类型通过它们与细脉的关联来识别，细脉是石油包裹体在紫外光下引起的颜色。早期石油流体在紫外荧光显微镜下呈蓝白色，早期水相流体包裹体在54 ~ 102 ℃之间主要均一化，盐度为12.0 ~ 16.7wt%NaCl当量。晚期石油流体在紫外落射荧光显微镜下呈黄色，晚期含水流体包裹体主要在85至135摄氏度之间均匀化，盐度范围为2.0至8.0wt%NaCl当量。为了获得这些流体的捕获温度（T-陷阱）和压力（P-陷阱）的准确测量，我们使用10对石油包裹体和同时代的水性流体包裹体来测量一些等容线的交叉。我们调查的早期流体的Ttrap在82到97摄氏度之间，Pttrap在97到259巴之间。相比之下，后期流体的Ttrap在141至170摄氏度之间，Ptrap值在430至608巴之间。结合区域埋藏史，早期流体充注时间为422 ~ 412 Ma BP，晚期流体充注时间为20 ~ 6 Ma BR（C）2016 Elsevier B. V.版权所有。
The well RP3-1 lies in the Tarim Basin, which is located in the southern Xinjiang Uygur Autonomous Region in northwest China. This region is one of the world's largest frontier basins. Drilling data that we collected on the well RP3-1 reveal a 2398-7066 m thick sedimentary sequence, containing Ordovician to Tertiary strata. The Yijianfang (O(2)yj) formation of the Middle Ordovician sequence is one of the most important reservoir stratums. The O(2)yj formation consists mainly of bioclast and intraclast limestones. Two different fluid types are identified by the associations they have with veinlets, which are colors caused by petroleum inclusions under UV light. Early-stage petroleum fluids are characterized by a blue white color under UV-epifluorescence microscopy, and early-stage aqueous fluid inclusions are mainly homogenized between 54 and 102 degrees C, with salinities ranging from 12.0 to 16.7 wt% NaCl equiv. Late-stage petroleum fluids are characterized by a yellow color under UV-epifluorescence microscopy, and late stage, aqueous-fluid inclusions are mainly homogenized between 85 and 135 degrees C, with salinities ranging from 2.0 to 8.0 wt% NaCl equiv. In order to obtain accurate measurements of both the trapped temperature (T-trap) and pressure (P-trap) of these fluids, we use 10 pairs of petroleum inclusions and coeval aqueous fluid inclusions to measure the intersection of a number of isochors. The Ttrap of early-stage fluids we surveyed were between 82 and 97 degrees C, with the Ptrap ranging from 97 to 259 bars. In contrast, the Ttrap of late-stage fluids were between 141 and 170 degrees C, with Ptrap values ranging from 430 to 608 bars. When combined with the regional buried history, the early-stage fluids charged from 422 Ma to 412 Ma BP, and the late-stage fluids charged from 20 Ma to 6 Ma BR (C) 2016 Elsevier B.V. All rights reserved.