高石梯—磨溪地区寒武系储层主控因素的地震地层学解释

四川盆地高石梯—磨溪地区寒武系发育颗粒滩白云岩储层，具有良好的天然气勘探前景。为了确定优质储层分布范围，通过地震地层学解释，利用钻井和地震资料将龙王庙组—洗象池群划分为4个四级层序，标定了4个海平面升降变化旋回；结合最大波峰振幅属性和地层厚度，认为颗粒滩白云岩储层受海平面变化和古地貌的双重控制。其中，颗粒滩白云岩储集层发育受四级海平面下降期的控制，呈带状展布，优质储集层发育在层序上超位置附近，近岸古地貌微幅度变化进一步影响储集层物性，局部古地貌高部位储层物性更为优越。地震地层学解释可以确定颗粒滩白云岩优质储集层发育区，并将对下一步该区具备相似成藏条件的奥陶系储层研究提供参考。

Seismic stratigraphy interpretation of main control factors of Cambrian reservoirs in Gaoshiti-Moxi Area

Grain-beach-dolomite reservoirs developed in the Cambrian of Gaoshiti-Moxi Area in Sichuan Basin have a good gas prospect.In order to determine the distribution range of high-quality reservoirs,the Longwangmiao Formation-Xixiangchi Group are divided into four fourth grade sequences based on drilling and seismic data with the seismic stratigraphy interpretation,and four cycles of sea-level rise and fall changes are calibrated.Combined with maximum peak-amplitude attributes and formation thickness,it is considered that grain-beach-dolomite reservoirs are controlled by sea level changes and paleo-geomorphology.Among them,the development of grain-beach-dolomite reservoirs is controlled by the fourth grade of sea level fall,with a belt-like distribution.High-quality reser-voirs developed near the onlapping of sequences,and the paleo-geomorphological micro-relief variation in the near shore had more influences on reservoir physical properties.Higher positions of local paleo-geomorphology have better reservoir physical properties.The seismic stratigraphy interpretation can confirm development areas of high-quality grain-beach-dolomite reservoirs and is useful for the study of Ordovician reservoirs with similar reservoir conditions in the area.