Evaluation of Upper Triassic T3x5 Source Rocks (Western Sichuan Depression, Sichuan Basin) and their Hydrocarbon Generation and Expulsion Characteristics: Implication for Tight-Sand Gas and Shale Gas Accumulation Potential Assessment
Evaluation of Upper Triassic T3x5 Source Rocks (Western Sichuan Depression, Sichuan Basin) and their Hydrocarbon Generation and Expulsion Characteristics: Implication for Tight-Sand Gas and Shale Gas Accumulation Potential Assessment
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上三叠统T3x5烃源岩（四川盆地川西坳陷）及其生排烃特征评价：对致密砂岩气、页岩气成藏潜力评价的启示
DOI：
10.1007/s11053-013-9202-z
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发表时间：
2013-03
影响因子：
5.4
通讯作者：
Fujie Jiang
中科院分区：
文献类型：
--
作者：
Yingchun Guo;Xiongqi Pang;Dongxia Chen;Keming Yang;Zhenxue Jiang;Xiaopeng Zhang;Fujie Jiang
一个非常规的、连续的石油系统由碳氢化合物的聚集组成，这些碳氢化合物存在于低基质渗透率的岩石中，并含有大量的碳氢化合物。侏罗系致密砂岩气和须家河组五段(T3x5)内的页岩气被认为是中国组目前最高产的新兴非常规气藏。首次在川西盆地进行了T3x5烃源岩的常规系统评价。研究了T3x5烃源岩的生排烃特征(包括生排烃强度、生排烃效率和生排烃数量)。结果表明，T3x5烃源岩厚度较大(一般为~200m)，总有机质含量较高(TOC在2.5~4.5wt%之间)，以III型干酪根为主。这些有利特征决定了该区在较高的热演化史(Ro)和热演化史(1.2%)下具有较大的生烃潜力。应用一种改进的生烃潜力方法对该区的钻井资料进行了分析，揭示了该地区T3x5烃源岩的生排烃特征。结果表明，烃源岩在Ro为1.06%时达到排烃门限，综合排烃效率约为60%。T3x5源岩的生排量分别为3.14亿×1010t和1.86亿×1010t，源岩内部残留量为1.28亿×1010t。成都凹陷侏罗系具有良好的生储结构(即生排烃中心位于成都凹陷)，侏罗系砂岩储层致密，T3×5源岩排出的天然气纵向和水平运移距离很短，预测其侏罗系将发育连续型致密砂岩天然气。T3x5源岩发育的侏罗系储集层的天然气聚集量达9.3万亿×108t，与几个活跃的美国页岩气藏相比，T3x5气页岩具有良好的成藏潜力。从体积上看，页岩气地质资源量可达1.05万×1010t，容积法与生烃潜力法计算结果相差不大，可能是与气页岩共生的夹层砂岩中存在其他天然气聚集所致。
An unconventional, continuous petroleum system consists of an accumulation of hydrocarbons that is found in low-matrix-permeability rocks and contain large amounts of hydrocarbons. Tight-sand gas in the Jurassic and shale gas within the fifth member of Xujiahe Formation (T3x5) are currently regarded as the most prolific emerging unconventional gas plays in China. The conventional and systematical evaluation of T3x5 source rocks was carried out for the first time in the western Sichuan basin (WSD). Hydrocarbon generation and expulsion characteristics (including intensity, efficiency, and amount) of T3x5 source rocks were investigated. Results show that T3x5 source rocks are thick (generally >200 m), have high total organic content (TOC, ranging from 2.5 to 4.5 wt%), and dominated by III-type kerogen. These favorable characteristics result in a great hydrocarbon generating potential under the high thermal evolution history (Ro > 1.2%) of the area. An improved hydrocarbon generation potential methodology was applied to well data from the area to unravel the hydrocarbon generation and expulsion characteristics of T3x5 source rocks in the WSD. Results indicate that the source rocks reached hydrocarbon expulsion threshold at 1.06% Ro and the comprehensive hydrocarbon expulsion efficiency was about 60%. The amount of generation and expulsion from T3x5 source rocks was 3.14 × 1010 and 1.86 × 1010 t, respectively, with a residual amount of 1.28 × 1010 t within the source rocks. Continuous-type tight-sand gas was predicted to develop in the Jurassic in the Chengdu Sag of the WSD because of the good source-reservoir configuration (i.e., the hydrocarbon generation and expulsion center was located in Chengdu Sag), the Jurassic sandstone reservoirs were tight, and the gas expelled from the T3x5 source rocks migrated for very short distances vertically and horizontally. The amount of gas accumulation in the Jurassic reservoirs derived from T3x5 source rocks is up to 9.3 × 108 t. The T3x5 gas shale has good accumulation potential compared with several active US shale-gas plays. Volumetrically, the geological resource of shale gas is up to 1.05 × 1010 t. Small differences between the amounts calculated by volumetric method compared with that by hydrocarbon generation potential methodology may be due to other gas accumulations present within interbedded sands associated with the gas shales.
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影响因子：
3.5
作者：
B. Tissot;R. Pelet;P. Ungerer
通讯作者：
B. Tissot;R. Pelet;P. Ungerer
影响因子：
7.5
作者：
Wei Li;Qin Sheng-fei;Hu Guoyi;Gong Yanjie
通讯作者：
Wei Li;Qin Sheng-fei;Hu Guoyi;Gong Yanjie
DOI：
--
发表时间：
2009-06
期刊：
--
影响因子：
--
作者：
M. D. Burnaman;John Shelton
通讯作者：
M. D. Burnaman;John Shelton
影响因子：
3.5
作者：
Lianbo Zeng
通讯作者：
Lianbo Zeng
影响因子：
4.2
作者：
Cramer, B;Poelchau, HS;Littke, R
通讯作者：
Littke, R