摘要
溶蚀孔洞是塔河油田奥陶系碳酸盐岩的主要储渗空间,因此研究碳酸盐岩岩溶测井响应特征以弄清其发育规律具有重要意义.在分析研究区内的岩溶地质特征之后,根据钻井揭示的岩溶型储集层,对岩心、测井特征进行了对比和归纳梳理,进而提炼了奥陶系岩溶发育带的测井响应特征.结合前人对岩溶风化壳发育的控制因素和分布特征的研究,依托岩心和成像测井资料刻度的岩溶带常规测井响应特征,在垂向上将岩溶层划分为表生岩溶带、垂直渗流岩溶带和水平潜流岩溶带,并对其分布规律进行了研究.结果表明:研究区地表岩溶带较发育,且基本属于未充填-半充填,是有利储集层发育的层位;潜流岩溶带不甚发育,基本被充填.总体上看,自东南向西北,溶洞发育带的分布密度逐渐增大,表明古岩溶作用的强度向西北方向逐渐增强.
Dissolved pores are reservoir permeability major space in Ordovician carbonate, the log characteristics of carbonate karst is very significant to understand its development patterns. In this paper, after the karst characteristics of workers are analyzed, based on the drilling results of the karst reservoir, the core and logging features are comparatively summarized and analyzed, the log response characteristics of Ordovician karst formation are summed up. Combined on previous development of karst weathering crust and distribution of the controlling factors of the research, relying on conventional logging response characteristics of karst which are calibrated using core and image logging data, the karst zones will be divided into epigenetic, vertical flow and horizontal subsurface flow in the vertical layer, and its distribution laws were studied. The results show that surface of karst zone is developed in the study area, and its belong to unfilled - half filled, so it is favorable reservoir development horizon; subsurface rock belts are not well developed, its are filled. On the whole, cave distribution density increases gradually from southeast to northwest, it show paleokarstification intensity to the northwest gradually.
出处
《地球物理学进展》
CSCD
北大核心
2013年第3期1483-1489,共7页
Progress in Geophysics
基金
国家自然科学基金项目(41072110)资助
关键词
塔河油田
碳酸盐岩
岩溶
测井响应
Tahe oilfield, carbonate rocks, Karst, log response
