Abstract：The structural feature of total graben was not carried out systematically in former petroleum-geologic evaluation of northern part of Yi-Shu graben,there was not uniform division plan of seismic and geologic horizons and the quality of seismic data was poorer,which affected the study of structure and sedimentation,meanwhile,the zone evaluation was not enough deep,so there is not clear direction of exploration.Based on available seismic data and fully combining with drilling,gravity,magnetic,electric and surrounding geologic data,the paper implemented the integrative evaluation work taking regional structural study as kernel and compared with Yitong graben,and carried out evaluation of the quality of seismic data at the same time,achieving following knowledge: ①Yi-Shu graben is upon the Paleozoic metamorphics basement and is filled up with four sets of sedimentary sequences: Mesozoic Cretaceous,Cenozoic Tertiary,Neogene and Quaternary,among which the Cretaceous and Tertiary are major prospecting objective strata;②the graben is characteristics of zoning in E-W direction and blocking in S-N direction structurally,each zone and block has different structure-lithology composition pattern,and blocking in S-N direction is main structural feature;③the Dongfa and Dongxing inclines in Tangyuan fault depression are favorable prospecting zones(category I) and Zheshugang incline in Fangzheng fault depression is favorable prospecting zone(category I).Based on above knowledge and structural industrial mapping in whole basin as well as Fangzheng and Tangyuan 3-D structural block-jointing together interpretation,the suggestion of 6 drilling wells was presented and five of which were accepted and 3 were drilled.
胡少华, 张少阳, 张宝权, 杨耀琴, 张福天, 杨波, 刘革莉, 郑健雄, 宋利霞, 刘啸虎, 孙志国. 依—舒地堑北段石油地质条件综合评价[J]. 石油地球物理勘探, 2008, 43(增刊1): 59-62.
Hu Shao-hua, Zhang Shao-yang, Zhang Bao-quan, Yang Yao-qin, Zhang Fu-tian, Yang Bo, Liu Ge-li, Zheng Jian-xiong, Song Li-xia, Liu Xiao-hu, Sun Zhi-guo. Integrative evaluation of petro-geologic condition in northern part of Yi-Shu graben. OGP, 2008, 43(增刊1): 59-62.
