沉积与特提斯地质2018，Vol.38Issue(2)：82-93,12.
黔北灯影组自生石英流体包裹体特征及油气成藏演化
Fluid inclusions in authigenic quartz and hydrocarbon accumulation in the Dengying Formation in Renhuai,northern Guizhou
摘要
Abstract
The study of stages and processes of the Sinian hydrocarbon accumulationis of important significance in the oil and gas exploration and deployment of the "Lower Association"petroliferous system in northern Guizhou. In this paper,the emphasis is placed on systematic analysis of fluid inclusions and oxygen isotope compositions in authigenic quartz and calcite as the pore-space fillings from the hydrocarbon reservoirs in the Sinian Dengying Formation in Renhuai,northern Guizhou. The reconstruction of paleogeothermal fields is based on bitumen reflectances of the Lower Cambrian Niutitang Formation in combination with the homogenization temperatures of fluid inclusions in authigene quartz in the Dengying Formation. The results of research have proved that the fluid inclusions occurring in authigenic quartz can be divided into three stages,with homogenization temperatures of 87. 1-98. 8℃,109. 4-126. 8℃ and 171. 3-190. 2℃, respectively. The homogenization temperatures of fluid inclusions in calcite filled in the later stages range between 95. 3℃ and 116. 4℃. The equivalent vitrinitere flectances of the Lower Cambrian Niutitang Formation vary from 3. 11% to 3. 43%. Judged from the homogenization temperatures of the fluid inclusions, it is believed that paleogeothermal gradients in the late Caledonian-Yanshanianmay vary from 2. 61℃/100 m to 2. 76℃/100 m. The δ18OPDB values range from -15. 0‰to -7. 8‰for dolomite filled in individual stages,and from -16. 1‰ to -14. 2‰for calcite filled in the later stages. It is inferred that the formation temperatures are estimated to be 92. 0-212. 5℃ and 74. 5-86. 3℃,respectively. Three stages of oil and gas accumulation and one stage of gas reservoirs destruction are recognized,including the first stage of oil and gas accumulation during the middle to late Caledonian shallow burial stage (442-428 Ma);the second stage of oil and gas accumulation during the late Hercynian to early Indosinian medium burial stages (252-232Ma);the third stage of gas accumulation during the early Yanshanian deep burial stage (170-155Ma ),and one stage of gas reservoirs destruction during the early Himalayan (ca. 42-30Ma)at the depths of 2963-3741m in the Dengying Formation in Renhuai,northern Guizhou.关键词
黔北/灯影组/油气成藏/自生石英/流体包裹体/均一温度/氧同位素Key words
Dengying Formation/oil and gas accumulation/authigenic Quartz/fluid inclusion/homogenization temperature/oxygen isotope/north Guizhou分类
能源科技引用本文复制引用
杨平,刘家洪,杨菲,汪正江,何江林..黔北灯影组自生石英流体包裹体特征及油气成藏演化[J].沉积与特提斯地质,2018,38(2):82-93,12.基金项目
中国地质调查局《四川盆地龙马溪组页岩气战略选区调查》(DD20160193)、《四川盆地页岩气基础地质调查》(DD20160176)、《四川盆地页岩气富集条件调查》(12120114071401)、国家自然科学基金《富有机质泥页岩内滑脱层形成机理及其油气输导能力研究》(41772126) （DD20160193）
