摘要
为了明确塔河油田海西早期构造演化及其对岩溶缝洞形成与油气运聚的影响,利用最新的叠前深度偏移数据及大量钻井资料,对塔河地区构造特征、水系分布、缝洞类型进行研究.通过层面追踪、精细相干技术,明确了研究区断层发育特征和构造差异演化历程,采用三维雕刻技术,刻画了地下河溶洞及中小型缝洞空间分布,多因素叠合分析认为研究区奥陶系海西早期存在差异抬升,控制着岩溶水系和缝洞分布.研究结果表明:海西早期I幕,塔河地区呈南北向隆起,北高南低,鹰山组残余地层南厚北薄;海西早期II幕,北西向挤压应力继续作用,构造脊线向东旋转,形成北东向鼻隆,同时鼻隆轴部发育北北东向低角度逆冲断层F3,使研究区发生差异演化;塔河六、七区沿F3断层逆冲抬升形成断鼻型峰丘高地,而塔河十、十二区相对下降,呈相对低缓的岩溶斜坡-洼地;斜坡-洼地区沉积了近200 m巴楚组含岩溶角砾砂砾岩层(C1b1),岩溶水系和地下河溶洞广泛发育,油井累产小于1×10^4 t;峰丘高地区未沉积C1b1段,断裂与缝洞复合体密集发育,油井累产大于20×10^4t.因此,差异抬升形成的峰丘高地成为了岩溶斜坡上的分水岭,控制着岩溶水系的分布,使地表河与地下河围绕分水岭呈裙带式分布于斜坡-洼地区;峰丘高地与深大断裂发育区成为油气运聚优势区,斜坡-洼地中的深大断裂带可形成油气"甜点".
In order to clarify the tectonic evolution process of early Hercynian and its control on the fracture-cave formation and hydrocarbon accumulation,the structural characteristics,palaeodrainage distribution and fracture-cave configuration types in Tahe area were studied on the basis of the latest seismic data of pre-stack depth migration and a large amount of drilling data.The characteristics of faults and differential tectonic evolution process in the study area were clarified by the method of layer tracking and fine coherence technology.The spatial distribution of big cave of underground river and other fracture-vug complex were clarified based on the technology of 3 D fracture-cave carving.It indicated that there was tectonic differential uplift of Tahe area in the early Hercynian,which controlled the distribution of palaeodrainage and fracture-cave distribution.The results showed that the Tahe area is a NS uplift in the first stage of the early Hercynian,with lower from north to south,and the residual strata of Yingshan formation were thicker in the south and thinner in the north.The tectonic ridge shifted to the east and formed the NE nasal uplift in the second stage of the early Hercynian by the continuous NW compressive stress.At the same time,a low angle NNE thrust fault(F3)developed in the axis of the nasal uplift,resulting in the differential lift in the study area.The 6 and 7 blocks were uplifted form F3 and formed a NNE karst peak hill plateau like fault anticlinal,while the 10 and 12 blocks in the northwest study area were relatively falling and forming a gentle karst slope-depression,where there is nearly 200 m clastic rock(C1b1)including karst breccia which deposited at the bottom of the Bachu formation,and karst water systems and underground river caves were widely developed and the cumulative oil output per well was less than 1×10^4 tons.Per well production was more than 20×10^4 tons in the karst peak hill plateau,where the fault,fracture-vug complex and fractures were densely developed.The compr
作者
张三
金强
乔贞
张旭栋
魏荷花
程付启
朱亚杰
ZHANG San;JIN Qiang;QAO Zhen;ZHANG Xudong;WEI Hehua;CHENG Fuqi;ZHU Yajie(School of Geosciences,China University of Petroleum,Qingdao,Shandong 266580,China;Liandaowan Oli Production Plant,Changqingshiye Group,Ansai,Shaanxi 717407,China;SINOPEC Exploration and Development Institute,Beijing 100083,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2020年第3期576-586,共11页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(U1663204)
国家油气重大专项(2016ZX05014-002-007)。
关键词
塔河油田
海西早期
差异演化
水系分布
油气运聚
缝洞雕刻
Tahe oilfield
early Hercynian
differential evolution
palaeodrainage distribution
hydrocarbon accumulation
fracture-cave carving
