哈萨克斯坦滨里海盆地油气地质特征及勘探方向

Oil-Gas Geological Features and Its Exploration Direction in Marginal Caspian Basin,Kazakhstan

滨里海盆地是一个典型的裂谷盆地,裂谷作用从古生代开始,形成巨厚的古生代和中生代沉积物,并伴生丰富的烃源岩建造,成为世界上沉积最厚、烃源岩最丰富的盆地之一。在油气的成藏组合上,以下二叠统孔谷组膏盐沉积为标志,发育盐上油气成藏组合和盐下油气成藏组合,盐上成藏组合以众多小型油气田为主,盐下成藏组合以大型油气田为主,它们共同构成了滨里海盆地的油气成藏特征,并以此确定了盐上和盐下油气藏的不同勘探方向。

Marginal Caspian Basin is an ideal rifted basin. Rifting process began from Paleozoic, since then, deposited thick Paleozoic and Mesozoic deposits and formed companied with rich hydrocarbon source rocks, and becomes one of the thickest deposit and richest hydrocarbon matter basins. The oil-gas reservoirs combinations include post salt and sub-salt reservoir combinations, which are characterized by gypsum-salt deposits deposited in Permian Kungurian Formation. Many small-sized oil-gas fields developed in post salt reservoir combination, but some large-sized oil-gas fields existed in sub-salt combination, which constitute oil and gas reservoirs' features in marginal Caspian Basin, and with the distribution regularity of theses oil-gas reservoirs, the exploration prospects and targets have been determined in the future.