酒泉盆地南缘老君庙构造带构造特征及油气勘探方向
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摘要
老君庙构造带是中国发现最早的老君庙油田所处的构造带,位于酒泉盆地南缘新生代前陆冲断带,叠置于早白垩世断陷盆地的南部隆起和石大凹陷之上。综合地震、非地震及地面露头资料研究分析后认为,老君庙构造带经历了中生代和新生代两期构造演化;在剖面上具有多层冲断席推覆叠置的结构特征;由于发育多条北北东向的调节断层,平面上的构造变形具有东西分段的结构特征,并具有西弱东强的变形趋势。利用钻井、测井资料对油气富集规律进行了探讨,研究表明其勘探目的层主要为古近系白杨河组间泉子段河流相砂岩层,油气主要来自青南次凹下白垩统烃源岩。通过对构造区块的剖析及对相应区带与圈闭的评价,指出134断块、庙西断块、庙西背斜以及中盘逆冲断片为下步油气勘探方向。
Laojunmiao structural belt is located in Cenozoic foreland thrust belt in southern margin of Jiuquan Basin, which is superposed over the southern uplift and Shida sag of Early Cretaceous faulted basin. Laojunmiao Oilfield, the earliest oilfield discovered in China, lies in this structural belt. Based on synthetic research and analysis with seismic and non-seismic data and field observations, Laojunmiao structural belt is believed to have experienced Mesozoic and Cenozoic structural evolution. Vertically, it features in the superposition of multiple thrust blocks. Horizontally, it is characterized by E-W segmentation due to the division of many NNE adjusting faults, as well as the structural deformation is strong in the east and weak in the west. Discussion is made on oil/gas accumulation regulation by using drilling and logging data. The research shows that the fluvial sandstone reservoir of Palaeogene Jianquanzi Member of Baiyanghe Formation is the main exploration target of the belt, oil and gas being mainly from Lower Cretaceous source rocks of Qingnan sub-sag. According to the analysis of structural area and the evaluation of corresponding zones and traps, it is believed that Fault block 134, Miaoxi Fault block, Miaoxi anticline, and the central thrust fragments are the target for further oil and gas exploration.
Laojunmiao structural belt is located in Cenozoic foreland thrust belt in southern margin of Jiuquan Basin, which is superposed over the southern uplift and Shida sag of Early Cretaceous faulted basin. Laojunmiao Oilfield, the earliest oilfield discovered in China, lies in this structural belt. Based on synthetic research and analysis with seismic and non-seismic data and field observations, Laojunmiao structural belt is believed to have experienced Mesozoic and Cenozoic structural evolution. Vertically, it features in the superposition of multiple thrust blocks. Horizontally, it is characterized by E-W segmentation due to the division of many NNE adjusting faults, as well as the structural deformation is strong in the east and weak in the west. Discussion is made on oil/gas accumulation regulation by using drilling and logging data. The research shows that the fluvial sandstone reservoir of Palaeogene Jianquanzi Member of Baiyanghe Formation is the main exploration target of the belt, oil and gas being mainly from Lower Cretaceous source rocks of Qingnan sub-sag. According to the analysis of structural area and the evaluation of corresponding zones and traps, it is believed that Fault block 134, Miaoxi Fault block, Miaoxi anticline, and the central thrust fragments are the target for further oil and gas exploration.
引文
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