我国石油公司在中东阿曼山西侧前陆盆地莱克维尔隆起拥有多个油气合作项目,由于勘探程度较低,对其区域构造与油气成藏特征的认识还不够深入。基于新的井震资料,开展莱克维尔隆起区构造、断裂解释与油气成藏分析。结果表明:①莱克维尔隆...我国石油公司在中东阿曼山西侧前陆盆地莱克维尔隆起拥有多个油气合作项目,由于勘探程度较低,对其区域构造与油气成藏特征的认识还不够深入。基于新的井震资料,开展莱克维尔隆起区构造、断裂解释与油气成藏分析。结果表明:①莱克维尔隆起在三叠纪—侏罗纪处于拉张环境,晚白垩世构造发生反转形成反转背斜,其形成主要受控于阿曼山快速隆升挤压作用,上覆古近系直接披覆于隆起区中白垩统之上呈不整合接触。②隆起区发育两组高角度正断层,断层形态在剖面上呈“Y”形、复合“Y”形,在平面上呈“X”形交叉分布;晚白垩世由于造山作用导致断层处于挤压状态。③研究区中生代长期处于被动陆缘,具有3类典型成藏模式,包括下白垩统Shuaiba组礁滩岩性油气藏、上白垩统Natih组断块型油气藏及地层不整合油气藏、古近系Umm er Radhuma组生物碎屑灰岩岩性油气藏;晚白垩世以来上侏罗统Diyab组、下白垩统Bab组2套主力烃源岩已进入成熟阶段,晚白垩世发育的不整合及三叠纪—侏罗纪伸展背景下形成的垂向断裂构成重要的油气输导体系,促进了区域油气聚集成藏。认为莱克维尔隆起顶部、西侧斜坡带与东侧前渊斜坡带的地质条件相似,具有较大勘探潜力,是未来重要的油气勘探方向。展开更多
Multiple sets of organic-rich shales developed in the Upper Paleozoic of the northwestern Guizhong Depression in South China. However, the exploration of these shales is presently at a relatively immature stage. The U...Multiple sets of organic-rich shales developed in the Upper Paleozoic of the northwestern Guizhong Depression in South China. However, the exploration of these shales is presently at a relatively immature stage. The Upper Paleozoic shales in the northwestern Guizhong Depression, including the Middle Devonian Luofu shale, the Nabiao shale, and the Lower Carboniferous Yanguan shale, were investigated in this study. Mineral composition analysis, organic matter analysis(including total organic carbon(TOC) content, maceral of kerogen and the vitrinite reflection(Ro)), pore characteristic analysis(including porosity and permeability, pore type identification by SEM, and pore size distribution by nitrogen sorption), methane isothermal sorption test were conducted, and the distribution and thickness of the shales were determined, Then the characteristics of the two target shales were illustrated and compared. The results show that the Upper Paleozoic shales have favorable organic matter conditions(mainly moderate to high TOC content, type Ⅰ and Ⅱ_1 kerogen and high to over maturity), good fracability potential(brittleness index(BI) > 40%), multiple pore types, stable distribution and effective thickness, and good methane sorption capacity. Therefore, the Upper Paleozoic shales in the northern Guizhong Depression have good shale gas potential and exploration prospects. Moreover, the average TOC content, average BI, thickness of the organic-rich shale(TOC > 2.0 wt%) and the shale gas resources of the Middle Devonian shales are better than those of the Lower Carboniferous shale. The Middle Devonian shales have better shale gas potential and exploration prospects than the Lower Carboniferous shales.展开更多
During the late Miocene(~5.5 Ma), a large-scale submarine slide with an area of approximately 18000 km^2 and a maximum thickness of 930 m formed in the deep-water region of the Qiongdongnan Basin. The large-scale subm...During the late Miocene(~5.5 Ma), a large-scale submarine slide with an area of approximately 18000 km^2 and a maximum thickness of 930 m formed in the deep-water region of the Qiongdongnan Basin. The large-scale submarine slide has obvious features in seismic profile, with normal faults in the proximal region, escarpments at the lateral boundary, and a pronounced shear surface at the base. The internal seismic reflections are chaotic and enclosed by parallel and sub-parallel seismic events.The main direction of sediment transport was from south to north and the main sediment source was the southern region of the Qiongdongnan Basin, which is located in the east of the Indo-China Peninsula and the north of the Guangle uplift. In this region,late Miocene strike-slip reversal of the Red River Fault, uplift and increased erosion of the Indo-China Peninsula, and an abrupt rise in the rate of deposition in the western part of the South China Sea provided the basic conditions and triggering mechanism for the large-scale submarine slide. The discovery of the large-scale submarine slide provides sedimentological evidence for the tectonic event of late Miocene strike-slip reversal of the Red River Fault. It can also be inferred that the greatest tectonic activity during the process of the Red River Fault reversal occurred at ~5.5 Ma from the age of top surface of the submarine slide.展开更多
文摘我国石油公司在中东阿曼山西侧前陆盆地莱克维尔隆起拥有多个油气合作项目,由于勘探程度较低,对其区域构造与油气成藏特征的认识还不够深入。基于新的井震资料,开展莱克维尔隆起区构造、断裂解释与油气成藏分析。结果表明:①莱克维尔隆起在三叠纪—侏罗纪处于拉张环境,晚白垩世构造发生反转形成反转背斜,其形成主要受控于阿曼山快速隆升挤压作用,上覆古近系直接披覆于隆起区中白垩统之上呈不整合接触。②隆起区发育两组高角度正断层,断层形态在剖面上呈“Y”形、复合“Y”形,在平面上呈“X”形交叉分布;晚白垩世由于造山作用导致断层处于挤压状态。③研究区中生代长期处于被动陆缘,具有3类典型成藏模式,包括下白垩统Shuaiba组礁滩岩性油气藏、上白垩统Natih组断块型油气藏及地层不整合油气藏、古近系Umm er Radhuma组生物碎屑灰岩岩性油气藏;晚白垩世以来上侏罗统Diyab组、下白垩统Bab组2套主力烃源岩已进入成熟阶段,晚白垩世发育的不整合及三叠纪—侏罗纪伸展背景下形成的垂向断裂构成重要的油气输导体系,促进了区域油气聚集成藏。认为莱克维尔隆起顶部、西侧斜坡带与东侧前渊斜坡带的地质条件相似,具有较大勘探潜力,是未来重要的油气勘探方向。
基金the financial support of the National Science and Technology Major Project of 2011ZX05005-003-008HZthe Science and Technology Project of Zhejiang Geological Survey Bureau(No.201713)the National Natural Science Foundation of China(No.41572110)
文摘Multiple sets of organic-rich shales developed in the Upper Paleozoic of the northwestern Guizhong Depression in South China. However, the exploration of these shales is presently at a relatively immature stage. The Upper Paleozoic shales in the northwestern Guizhong Depression, including the Middle Devonian Luofu shale, the Nabiao shale, and the Lower Carboniferous Yanguan shale, were investigated in this study. Mineral composition analysis, organic matter analysis(including total organic carbon(TOC) content, maceral of kerogen and the vitrinite reflection(Ro)), pore characteristic analysis(including porosity and permeability, pore type identification by SEM, and pore size distribution by nitrogen sorption), methane isothermal sorption test were conducted, and the distribution and thickness of the shales were determined, Then the characteristics of the two target shales were illustrated and compared. The results show that the Upper Paleozoic shales have favorable organic matter conditions(mainly moderate to high TOC content, type Ⅰ and Ⅱ_1 kerogen and high to over maturity), good fracability potential(brittleness index(BI) > 40%), multiple pore types, stable distribution and effective thickness, and good methane sorption capacity. Therefore, the Upper Paleozoic shales in the northern Guizhong Depression have good shale gas potential and exploration prospects. Moreover, the average TOC content, average BI, thickness of the organic-rich shale(TOC > 2.0 wt%) and the shale gas resources of the Middle Devonian shales are better than those of the Lower Carboniferous shale. The Middle Devonian shales have better shale gas potential and exploration prospects than the Lower Carboniferous shales.
基金supported by the National Natural Science Foundation of China (Grant Nos. 41576049, 91228208, 91028007 & 91428309)
文摘During the late Miocene(~5.5 Ma), a large-scale submarine slide with an area of approximately 18000 km^2 and a maximum thickness of 930 m formed in the deep-water region of the Qiongdongnan Basin. The large-scale submarine slide has obvious features in seismic profile, with normal faults in the proximal region, escarpments at the lateral boundary, and a pronounced shear surface at the base. The internal seismic reflections are chaotic and enclosed by parallel and sub-parallel seismic events.The main direction of sediment transport was from south to north and the main sediment source was the southern region of the Qiongdongnan Basin, which is located in the east of the Indo-China Peninsula and the north of the Guangle uplift. In this region,late Miocene strike-slip reversal of the Red River Fault, uplift and increased erosion of the Indo-China Peninsula, and an abrupt rise in the rate of deposition in the western part of the South China Sea provided the basic conditions and triggering mechanism for the large-scale submarine slide. The discovery of the large-scale submarine slide provides sedimentological evidence for the tectonic event of late Miocene strike-slip reversal of the Red River Fault. It can also be inferred that the greatest tectonic activity during the process of the Red River Fault reversal occurred at ~5.5 Ma from the age of top surface of the submarine slide.
