川中古隆起灯影组储层发育控制因素及展布  

Controlling factors and distribution of reservoir development in Dengying Formation of paleo-uplift in central Sichuan Basin

作　　者：罗冰 杨跃明 罗文军 文龙 王文之 陈康 

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041

出　　处：《石油学报》2015年第4期416-426,共11页Acta Petrolei Sinica

基　　金：国家重大科技专项(2011ZX05004-005);中国石油天然气股份有限公司重大勘探专项(2012ZD01)资助

摘　　要：以四川盆地川中古隆起区深层最古老的震旦系碳酸盐岩为研究对象,通过对储层宏观、微观特征观察及储层发育控制因素的深入研究,表明灯影组储层为"丘滩相+岩溶"复合成因类型,储层发育受丘滩相的控制,岩溶叠加改造扩溶或新增孔隙(洞)是现今储集空间的主体。同时提出桐湾期灯影组岩溶为早成岩期层控(受丘滩相约束)型风化壳岩溶,川中古隆起区丘滩相与区域性岩溶作用的大面积叠合是灯影组储层大规模连片发育的关键。受丘滩相发育程度和岩溶改造强度差异的影响,古隆起区不同区带储层发育程度存在差异,高石梯构造—磨溪构造西侧南北向带状区为储层发育"甜点"区。灯影组储层预测的关键在于丘滩体的有效识别和岩溶地貌的精细刻画,寻找与磨溪—高石梯类似的丘滩体和岩溶残丘—岩溶陡坡叠合区。The most ancient deep Sinian carbonate rocks in paleo uplift of central Sichuan Basin were taken as research object.Through the observation of macroscopic and microscopic reservoir characteristics and deep study on the controlling factor of reservoir development,the results show that Dengying Formation reservoir is classified as the composite genetic type of “bioherm-beach facies ＋ karst”;the development of reservoir is mainly controlled by bioherm-beach facies.The expanded or added pores （holes） due to karst superimposed reformation are the main body of current reservoir space.Meanwhile,it is put forward that the karst of Dengying Formation in Tongwan stage is stratabound-weathering crust karst （restrained by bioherm-beach facies） in early diagenesis stage,and the biohermbeach facies in paleo-uplift of central Sichuan Basin with extensively superimposition of regional karstification is the key for continuous development of the large-scale reservoir in Dengying Formation.Impacted by the differences in development degrees of bioherm-beach facies and the intensities of karst transformation,the degrees of reservoir development are diversified in various zones of the paleo-uplift,and the N-S trending belt zone on the west side of Gaoshiti-Moxi structure is the “sweet spot” of reservoir development.The key of reservoir prediction in Dengying Formation mainly depends on the effective identification of bioherm-beach facies and fine description of karst landform,so as to find the bioherm-beach facies similar to Moxi-Gaoshiti and the karst monadnock-slope superimposed area.

关 键 词：四川盆地 川中古隆起 灯影组 古岩溶 储层 控制因素 分布预测 

分 类 号：TE112.2[石油与天然气工程—油气勘探]