碳酸盐岩层序地层储层预测——十万大山地区的应用  

Carbonate reservoirs prediction with sequence stratigraphy:application in Shiwandashan area

作　　者：李国蓉[1] 王鑫[1] 周心怀[2] 乔占峰[1] 曾允孚[1] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,四川成都610059 [2]中国海洋石油总公司天津分公司,天津300452

出　　处：《石油与天然气地质》2006年第3期413-421,共9页Oil & Gas Geology

摘　　要：利用层序地层学研究可将碳酸盐岩储层分为层序内部储层和层序界面储层。在研究中首先根据碳酸盐岩生长率判断上述两类储层的发育潜力;然后,通过等时单元礁滩相展布的精细刻划预测层序内部储层的发育分布,通过层序不整合面类型及性质分析,预测评价层序界面储层的发育状况。十万大山地区泥盆系为“进积楔”型台地,碳酸盐岩生长率低,主要发育受“Ⅰ型层序不整合界面”控制的储层,储层总体发育良好;石炭纪为陆表海“加积”型台地,碳酸盐岩生长率低,属于受四级层序界面和三级层序界面控制的层序界面储层,储层发育状况较差;下二叠统层序内部储层和受三级层序界面控制的层序界面储层均欠发育,仅凭祥-东门断裂北侧发育的点状生物礁储层,以及受东吴期构造层序界面控制的岩溶缝孔洞型储层应予以重视;上二叠统碳酸盐岩层序内部储层和层序界面储层均不发育;下三叠统,北部台地碳酸盐岩生长率较高,层序内部储层和层序界面储层均有发育,南部台地碳酸盐岩生长率低,两类储层均不发育。主要发育的储层段与二级海平面旋回海退期密切联系。Carbonate reservoirs can be divided into intra-sequence reservoirs and sequence boundary reservoirs based on study of sequence stratigraphy. First of all, the development potentials of the two types of reservoirs mentioned above are defined according to the growth rate of carbonates, then the distribution of intra-sequence reservoirs is predicted through detailed delineation of the distribution of isochronous unit reef flat facies ; and the development of sequence boundary reservoirs is predicted on the basis of analysis of the types and natures of sequence unconformity surfaces. The Devonian in Shiwandashan area is a ＂progradational wedge＂ platform with low growth rate of carbonates, and is dominated by reservoirs controlled by ＂type-Ⅰ sequence unconformity interface＂; as a whole, the reservoirs are well developed. The Carboniferous is an ＂aggradational＂ platform in epicontinental sea with low growth rate of carbonates, and is dominated by sequence boundary reservoirs under the control of the fourth-order and third-order sequence boundaries; the reservoirs are poorly developed. Both the intra-sequence reservoirs and the sequence boundary reservoirs under the control of third-order sequence boundary in the Lower Permian are poorly developed; only the scattered point reef reservoirs developed to the north of Pingxiang-Dongmen fault and the karstic, fractured and vuggy reservoirs controlled by the sequence boundary formed during Dongwu tectonic movement are worthy to be considered. Neither the intra-sequence reservoirs nor the sequence boundary reservoirs are developed in the Upper Permian carbonates. As for the Lower Triassic, both intra-sequence reservoirs and sequence boundary reservoirs are developed in the northern Dart of the platform due to the high growth rate of carbonates, but neither of them is developed in the southern part of the platform due to the low growth rate of carbonates. The main reservoirs are closely related with the regression phase of second-order eustatic cycle.

关 键 词：层序内部储层 层序界面储层 碳酸盐岩生长率 储层预测 泥盆系-下三叠统 十万大山 

分 类 号：TE112.2[石油与天然气工程—油气勘探]