摘要
白马区块是涪陵页岩气田的重要接替区,其储层特征和成藏机制与中浅层页岩气藏存在较大差异。研究发现,研究区页岩含气量垂向差异明显,构造稳定性对气体赋存有显著影响,含气性表现为向斜核部>斜坡>边缘断层褶皱,与断裂带距离增加,含气量与游吸比升高。不同构造部位储层物性差异较大,向斜核部与平缓斜坡带储集条件更好,有机孔保存良好。构造运动是导致含气性差异的关键,向斜核部埋深大、抬升小、保存条件好含气量最高,边缘区因抬剥强烈、孔隙破坏含气量最低。
The Baima area is an important replacement block in the Fuling shale gas field,whose reservoir characteristics and accumulation mechanisms differ significantly from those of middle–shallow shale gas reservoirs.The study reveals that shale gas content in the area varies markedly in the vertical direction,with structural stability exerting a significant influence on gas occurrence.Gas-bearing capacity follows the order syncline core>slope>marginal fault–fold zone,with both gas content and adsorbed/free gas ratio increasing with distance from fault zones.Reservoir properties vary considerably among different structural positions;syncline cores and gentle slopes exhibit better storage conditions and well-preserved organic pores.Structural movement is the key factor causing differences in gas-bearing capacity—the syncline core,with greater burial depth,smaller uplift,and better preservation conditions,has the highest gas content,while the marginal zone,with strong uplift and erosion,shows the lowest.
作者
王谣
WANG Yao(Sinopec Chongqing Fuling Shale Gas Exploration and Development Corporation,Chongqing 408014,China)
出处
《江汉石油职工大学学报》
2025年第6期7-9,共3页
Journal of Jianghan Petroleum University of Staff and Workers
关键词
白马区块
页岩气
储层特征
赋存规律
Baima area
shale gas
reservoir characteristics
occurrence pattern
