摘要
利用研究区钻井、测井和地震资料,通过良里塔格组礁滩组合体的地震地层学研究,总结出礁滩发育带的地震地质综合识别标志、初步圈定了分布范围,并建立退积式发育模式,进一步探讨构造古隆起、坡折带与礁滩发育带的关系及其发育分布规律。研究区碳酸盐岩台地及礁滩复合体的发育分布主要受古隆起控制,总体上呈北东向展布,内部发育北东、北西两个受局部隆起构造带控制的礁滩沉积相带,其中北东向浅滩发育带规模较大,向东延伸至塔中古隆起;受晚奥陶世早期持续海进影响,浅滩相带向古构造隆起顶部退积,平面分布范围向上缩小,良里塔格组中下部礁滩较发育,上部几乎不发育;由于研究区台地边缘带构造坡折幅度小,根据地震识别的礁滩沉积复合体可能主要是粒屑滩,台缘生物礁相对不发育。
Reef-bank bodies are favorable for developing carbonate reservoirs. By the study of seismic stratigraphy of Lanlitage Formantion through the data of drilling,well logging and seismic profiles in Hetian river area,the seismic indicators of reef-bank comolex were obtained,their distribution was described,and a retrograding model for the development of reef-bank complex was established. The analysis of the relationship between the reef-bank complex and paleo-uplift,as well as the edge of slope, indicates that the distribution of reef-bank complex was controlled by the paleo-uplift. The reef-bank complex generally distributed as belt along the axis of the paleo-uplift from SW to NE. Two sub-belts corresponded to local structural belt within the paleo-uplift was recognized,one is SW-NE,other one is SE-NW. The SW-NE is the main one,extending to Tazhong paleo-uplift. With the effect of successively rising of sea level in the early time of Later Ordovician,the reef-bank complex retrograded from the edge of platform to the top area of the paleo-uplift,so that their scope decreased upward,and they mainly occurred in the lower to middle para-sequences. As the slope was very flat,the reef bank bodies detected from seismic profiles may be the banks mainly. It is not suitable for the development of reefs in this area.
出处
《矿物岩石》
CAS
CSCD
北大核心
2006年第2期80-86,共7页
Mineralogy and Petrology
