摘要
基于四川盆地震旦系灯影组16口井岩心和11条露头剖面的观察，结合128个碳氧同位素数据的系统分析，研究了震旦系灯影组储层特征、探讨了灯影组储层发育与桐湾期三幕构造运动的关系，预测了其优质储层分布区域。结果表明：1）四川盆地震旦系为典型的镶边碳酸盐岩台地沉积体系，围绕绵竹-长宁裂陷两侧发育大型的台缘丘滩体，岩石类型以泥粉晶白云岩、藻砂屑白云岩、层纹石白云岩、凝块石白云岩和雪花状白云岩为主；2）受桐湾期三幕构造运动和海平面频繁升降变化的影响，形成了灯二段和灯四段两套风化壳岩溶储层，储层以低孔低渗为特征，溶蚀孔洞发育，为裂缝-孔洞型储层；3）灯二段和灯四段两套储层横向上分布较稳定，纵向上互相叠置，大面积分布；优质储层主要分布在台地边缘相带，主要集中在高石梯、磨溪、荷包场、威远、资阳、蓬莱等地区。
Based on data of 16 drilling cores, observation of 11 outcrop profiles and comprehensive analysis on 128 carbon-oxygen isotope data, the characteristics of karst carbonate reservoirs in Dengying Formation and the relationship between the forming of Dengying reservoirs and 3 episodes of Tongwan Movement were discussed, and the distribution of its high-quality reservoirs was then predicted. Results show： 1） Typical rimmed carbonate platform sedimentary system was developed in Sinian of Siehuan Basin, and large-scale platform margin reef shoal was formed on both sides of Mianzhu-Changning rift, which mainly consisted of micrite dolomite, algal sandy dolarenite, laminated dolomite, clotted dolomite and snowflake-shaped dolomite; 2） Influenced by the 3 episodes of Tongwan Movement and frequent fluctuation of sea level, weathering-crust karst carbonate reservoirs were developed in Deng-2 Member and Deng-4 Member, which were characterized by low porosity and permeability with abundant dissolved pores and vugs as fracture- vug reservoirs; 3） The two sets of reservoirs in Deng-2 Menber and Deng-4 Member were distributed stably in horizontal direction and overlapped in vertical direction; the reservoirs were widely spread, while the high-quality reservoirs were situated in the platform margin facies zone, which was concentrated in the Gaoshiti, Moxi, Hebaochang, Weiyuan, Ziyang and Penglai areas.
出处
《地质科学》
CAS
CSCD
北大核心
2017年第1期254-269,共16页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家科技重大专项（编号：2011ZX05007）资助.
关键词
震旦系
岩石类型
风化壳
桐湾运动
碳氧同位素
Sinian
Rock type
Weathering crust
Tongwan Movement
Carbon andoxygen isotopes
