建南及周缘地区长兴组层序-岩相古地理特征  

Sequence and the Lithofacies Palaeogeographic Characteristics of Changxing Formation in Jiannan Region

作　　者：付晓树 胡明毅[1,2] 王丹[3] 胡忠贵[1,2] 

机构地区：[1]长江大学地球科学学院 [2]油气资源与勘探技术教育部重点实验室,武汉430100 [3]中石油华北油田研究院,任丘062552

出　　处：《科学技术与工程》2015年第7期41-49,共9页Science Technology and Engineering

基　　金：国家自然科学基金项目(41372136);教育部博士点基金(20124220110004);国家“十二五”重大科技专项(2011ZX05007-002-001)联合资助

摘　　要：以野外剖面、岩心、录测井等资料为基础,结合区域地质背景,在建南地区上二叠统识别出局部暴露不整合界面和岩性岩相转换界面,据此将长兴组划分为2个Ⅱ型三级层序,平均每个层序延时2.9 Ma,每个三级层序内部仅发育海侵体系域(TST)和高位体系域(HST)。以体系域为编图单元,编制了层序格架内岩相古地理图,详细分析了建南地区长兴组岩相古地理特征。研究表明建南地区长兴组早期以碳酸盐缓坡模式为主,进一步划分为浅水缓坡和深水缓坡和盆地等沉积相带;中后期以碳酸盐台地模式为主,发育开阔台地、台地边缘、台地前缘斜坡、浅水陆棚、深水陆棚等沉积相带。物性分析表明台缘礁和台缘滩具有较好的储集性能,经白云石化作用等后期成岩作用改造后形成的白云岩储层具有更好的储集性能。因此研究区主要发育礁储集层、滩储集层和白云岩储集层。储层主要发育于高位体系域,尤以Sq1-HST最为发育。Based on field section data, core, logging and seismic data and so on, combined with the regional geological setting, two kinds of Permian sequence boundary types were recognized which were consisted of local exposed unconformity interface and lithologic and petrographic conversion interface in Jiannan Region. Hereby, Chang xing Formation was divided into two third-order sequences of Type Ⅱ sequences and the average for each sequence delay 2.9 million years. The internal constitute of each third-order sequence only developed into transgressive system tract （TST） and high-stand system tract （HST）. Sequence stratigraphic framework within lithofacies palaeogeography maps have been drawned up on condition of system tract as drawing unit, then detailed analyzing for the lithofacies palaeogeographie characteristics of the Changxing Formation, in Jiannan area. Studies have shown that the earlier Changxing Formation of Jiannan area is mainly consist of carbonate ramp, further divided into the sedimentary facies zones includes shallow ramp and deep-water ramp and basin sedimentary facies, etc. In the Middie-Later Period consist of Carbonate platform, developed open platform, platform margin, platform foreslop, shallow shelf and deep water shelf sedimentation zones and so on. The porosity and permeability analysis indicates that the platform margin reef and platform-margin beach has good reservoir property, dolomite Reservoir which is form after reformed by post sedimentary diagenesis such as dolomitization and so on has better reservoir property. So, the study area mainly developed biohermal reservoir, oolitic beach reservoirs and dolomite reservoir. Reservoirs are mainly developed in high-stand system tract, especially？ developed in Sql of HST.

关 键 词：建南地区 长兴组 层序地层 岩相古地理 储集层预测 

分 类 号：TE121.3[石油与天然气工程—油气勘探]