巴西桑托斯盆地A区块Barra Velha组古地貌及其对储层的控制

Velha组为研究区主力含油层位，区域古地貌控制了沉积相带和储层的分布。同时，古地貌的起伏影响同生期的成岩作用，也间接控制了储层的品质。通过岩心、测井和地震资料综合分析，综合利用印模法、残余厚度法，结合压实校正进行不同岩性的厚度恢复，对目标区块Barra Velha组沉积期的古地貌进行恢复，平面上将古地貌划分为古构造深水区、古构造斜坡—洼地区、古构造次高地及古构造高地。在古地貌的平面分区特征分析的基础上，结合沉积特征和同生期的暴露环境，进行沉积和储层研究，识别研究区优质储层发育区。

PALEOGEOMORPHOLOGY OF THE BARRA VELHA FORMATION IN BLOCK A OF THE SANTOS BASIN,BRAZIL, AND ITS CONTROL OVER RESERVOIRS

The Barra Velha Formation is the main oil-bearing zone in the Santos Basin of Brazil. Paleogeomorphology controls the distribution of sedimentary facies and reservoirs, in addition to early diagenesis, that result in variation in reservoir types and quality. Comprehensive studies have been carried out based on well data, core data, well log data and seismic data by using imprinting method, residual thickness method, combined with compaction correction to reconstruct the paleogeomorphology of Bara Velha Formation. Four zones are recognized in the target area, i.e. deep water zone, slope and low structure zone, sub-high structure zone and high structure zone. The zones of high quality reservoir are recognized by the paleogeomorphology features, sedimentary facies and exposure environment.