柴西芒崖坳陷中心新构造样式的确立及意义
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摘要
在区域地质背景分析的基础上,根据露头、钻井、地震资料建立了柴达木盆地芒崖坳陷中心新的构造样式:新生代早期以挤压叠瓦逆冲为主,走滑调节为辅,形成深部基底卷入型断层及相关挤压逆冲断块和挤压褶皱;新生代晚期以走滑调节为主,挤压逆冲为辅,形成浅层滑脱断层-褶皱组合,并最终定型。在构造样式确立的基础上,通过构造几何学、运动学分析,对芒崖坳陷中心地区新生代构造应力场变迁、构造层变形机制进行详尽的阐述,重塑了新生代以来该地区的构造演化历史。根据构造裂缝发育规律,指出新生代2次构造旋回的张性应力集中区,有利于裂缝储集层的发育,是下一步油气勘探的重点区带。
Based on the analysis of regional geological setting,integrated with data from field outcrop,drilling and seismic interpretation,the new structural style in the center of Mangya depression was established as follows: in the Early Cenozoic,the structural style in Mangya depression is dominated by compressional,imbricated and obduction modes and fewer strike-slip adjustment,forming deep basement-involved faults,compressional thrust fault blocks and compressional folds;in the Late Cenozoic,the style in it is dominated by strike-slip adjustment and fewer compressional and obduction modes,shaping shallow detachment fault-fold assemblage,and then finalizing the styles.Based on analyses of the structural styles in geometry and kinematics,the transition of tectonic stress field and the deformation mechanism of structural zones of the Cenozoic in the centre of Mangya depression are elaborated,reconstructing the history of structural evolution in this area.Finally,according to the distribution of structural fractures,it is pointed out that the concentrated areas of tensile stress in two tectonic cycles are favorable to the development or formation of fractured reservoirs,and should be regarded as the target zones for petroleum exploration in the future.
Based on the analysis of regional geological setting,integrated with data from field outcrop,drilling and seismic interpretation,the new structural style in the center of Mangya depression was established as follows: in the Early Cenozoic,the structural style in Mangya depression is dominated by compressional,imbricated and obduction modes and fewer strike-slip adjustment,forming deep basement-involved faults,compressional thrust fault blocks and compressional folds;in the Late Cenozoic,the style in it is dominated by strike-slip adjustment and fewer compressional and obduction modes,shaping shallow detachment fault-fold assemblage,and then finalizing the styles.Based on analyses of the structural styles in geometry and kinematics,the transition of tectonic stress field and the deformation mechanism of structural zones of the Cenozoic in the centre of Mangya depression are elaborated,reconstructing the history of structural evolution in this area.Finally,according to the distribution of structural fractures,it is pointed out that the concentrated areas of tensile stress in two tectonic cycles are favorable to the development or formation of fractured reservoirs,and should be regarded as the target zones for petroleum exploration in the future.
引文
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[15]王桂宏,李永铁,张敏,等.柴达木盆地英雄岭地区新生代构造演化动力学特征[J].地学前缘,2004,11(4):417-423.
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[17]欧成华,董兆雄,魏学斌,等.柴达木盆地干柴沟-咸水泉地区中深层成岩演化及其对储集体性能的影响[J].古地理学报,2011,13(1):85-95.
[18]李贤庆,钟宁宁,王康东,等.柴达木盆地西部古近-新近系油气充注研究[J].新疆石油地质,2011,32(1):1-3.
[2]莫午零,郑亚东,张文涛,等.柴达木盆地油泉子储油构造分析[J].石油与天然气地质,2007,28(3):324-328.
[3]张守仁,万天丰.柴西北地区断裂活动及构造演化[J].石油勘探与开发,2004,31(2):46-49.
[4]易定红,袁剑英,裴明利,等.柴西油泉子地区古近系下干柴沟组下段物源方向与沉积体系研究[J].东华理工大学学报(自然科学版),2009,32(3):226-230.
[5]于福生,王彦华,李学良,等.柴达木盆地狮子沟-油砂山构造带变形特征及成因模拟[J].大地构造与成矿学,2011,35(2):207-215.
[6]刘伟,林承焰,管全俊,等.油泉子油田低渗透储层特征分析及岩性识别[J].测井技术,2009,33(1):47-51.
[7]倪金龙,王鹏,杜小亮,等.柴达木盆地西南部新生代构造样式及其动力学特征[J].油气地质与采收率,2009,16(1):9-16.
[8]张克信,王国灿,陈奋宁,等.青藏高原古近纪-新近纪隆升与沉积盆地分布耦合[J].地球科学-中国地质大学学报,2007,32(5):583-596.
[9]任收麦,葛肖红,刘永江.阿尔金断裂带研究进展[J].地球科学进展,2003,18(3):386-391.
[10]陈正乐,宫红良,李丽,等.阿尔金山脉新生代隆升-剥露过程[J].地学前缘,2006,13(4):91-102.
[11]王永,李德贵,肖序常,等.西昆仑山前晚新生代构造活动与青藏高原西北缘的隆升[J].中国地质,2006,33(1):41-47.
[12]陈正乐,张岳桥,陈宣华,等.阿尔金断裂中段晚新生代走滑过程的沉积响应[J].中国科学(D辑),2001,31(增刊):90-96.
[13]倪金龙,周莉,赵小花,等.柴达木盆地红沟子鼻状构造新生代油气成藏特征[J].天然气地球科学,2008,19(1):107-110.
[14]党玉琪,尹成明,赵东升,等.柴达木盆地西部地区古近纪与新近纪沉积相[J].古地理学报,2004,6(3):297-306.
[15]王桂宏,李永铁,张敏,等.柴达木盆地英雄岭地区新生代构造演化动力学特征[J].地学前缘,2004,11(4):417-423.
[16]黄立功,钟建华,郭泽清,等.阿尔金造山带中、新生代的演化[J].地球学报,2004,25(3):287-294.
[17]欧成华,董兆雄,魏学斌,等.柴达木盆地干柴沟-咸水泉地区中深层成岩演化及其对储集体性能的影响[J].古地理学报,2011,13(1):85-95.
[18]李贤庆,钟宁宁,王康东,等.柴达木盆地西部古近-新近系油气充注研究[J].新疆石油地质,2011,32(1):1-3.
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