THE STUDY ON BITUMEN AND FOREGONE POOL OF FEIXIANGUANOOLITIC IN NORTHEAST SICHUAN BASIN
THE STUDY ON BITUMEN AND FOREGONE POOL OF FEIXIANGUANOOLITIC IN NORTHEAST SICHUAN BASIN
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发表时间：
2005
影响因子：
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通讯作者：
Xie Zeng-ye;Tian Shi-cheng
中科院分区：
文献类型：
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作者：
Xie Zeng-ye;Tian Shi-cheng
飞仙关是四川盆地东北地区迄今为止发现的最大的鲕粒气田。川东北储层普遍含固体沥青，含量为0.09% ~ 2.50%。在所有类型的储集岩中，沥青的含量以鲕状白云岩最为丰富。沥青的丰度与产气量、气藏规模和储层连续性有关。利用全岩热解和环境扫描电镜（ESEM2020）等新方法模拟和观察储层沥青的生气过程。结果表明：沥青生气潜力与沥青成熟度有关，新生气碳同位素组成较轻；储层沥青中甾烷和萜烷生物标记物分布正常，不存在降解和水洗的25-去藿烷。沥青被解释为液态烃裂解残渣。飞仙关气中ln（C_1/C_2）和ln（C_2/C_3）的比值保持了原油裂解气的特征。在古隆起的基础上，根据储层分布和沥青含量预测了前储层的分布。该发现可用于指导天然气的进一步勘探。
The biggest Feixianguan oolitic gas field has been found in northeast area of Sichuan basin up to date. The reservoir in northeastern Sichuan basin generally contains solid bitumen and its content is 0.09% to 2.50%. Of all the types of reservoir rocks, the content of bitumen is the most abundant in the oolitic dolomite. The abundance of bitumen is related to the gas yield, gas pool scale and reservoir continuity. Novel methods such as whole rock pyrolysis and Environmental Scanning Electron Microscope (ESEM2020) are utilized to simulate and observe gas generation from the reservoir bitumen. The results show that the potential of gas generation from bitumen is related to bitumen maturity, and that newly generated gas has light carbon isotope composition. The distibution of sterance and terpane biological markers in reservoir bitumen is normal, and there is no 25-norhopane of degration and water washing. The bitumen is interpreted to be residue of liquid hydrocarbon cracking. The ratio of ln(C_1/C_2) and ln(C_2/C_3) in Feixianguan gases keeps the character of crude oil cracking gas. Based on the palaeohigh, the distribution of foregone pool have been predicted according to the reservoir distribution and bitumen content. The finding can be applied to guidance of further exploration of natural gases.