火山活动影响下的碎屑岩地层对比方法及应用-以缅甸中央岛弧带为例

火山岩与碎屑岩成因机制不同,造就了两者的混积地层在对比过程中的穿时现象成为制约勘探的难点。以缅甸中央岛弧带为例,综合利用地震、测井、录井及分析化验等资料,探讨了火山活动影响下的碎屑岩地层对比方法。按照成因将地层划分为沉积旋回、火山旋回和混合旋回三类;并建立了不同成因旋回的对比原则和技术方法。最终将缅甸中央岛弧带五套地层划分为16个层组、44个层段。综合评价认为古新统Ⅲ、Ⅴ段沉积反旋回砂体较为发育,后期勘探中应重点关注。

Correlation Method and Application of Clastic Strata Influenced by Volcanic Activity- Take Myanmar Central Island Arc for Example

The diachroneity phenomenon in stratigraphy correlation of volcanic rock and clastic rock caused by different genetic mechanism has been restricting hydrocarbon exploration. Combining seismic, well logging, drilling and analysis data, this paper took Myanmar central island arc for example and discussed the correlation method of strata mixed by volcanic and clastic rock. The strata can be divided into three types according to the genesis: sedimentary cycle, volcanic cycle and mixed cycle. The correlation principle and technical method of different genetic cycles are established. Finally, the five sets of strata are divided into 16 group layers and 44 formation layers. Comprehensive evaluation shows that the III and V reverse cycle sand bodies of Paleocene are relatively well developed which should be concerned in the succedent exploration.