中国陆相储层表征与成藏型式

THE RESERVOIR CHARACTERIZATION AND POOL-FORMING PATTERNS IN TERRESTRIAL FORMATION OF CHINA

:中国中、新生代陆相沉积盆地主要有 3种类型 ,其巨厚的地层中含有丰富的油气资源。陆相沉积作用所特有的地质条件 ,决定了储集岩的矿物及结构成熟度偏低 ,物性变化大 ,非均质性较强 ,砂体连续性较复杂。储层砂岩与泥岩大多呈薄互层状。储层物性受埋藏深度及成岩作用等因素所控制。在湖盆内储层砂体邻近生烃区 ,油气运移距离短 ,砂体类型决定主要运移方式 (侧向或垂向 )。有利圈闭为岩性、构造岩性、断块及断层等类型。文中按砂体成因归纳出 8种陆相储层成藏型式。

Three types of terrestrial basins, in which formations with gigantic thickness were deposited and rich hydrocarbon was accumulated, were developed in the Mesozoic to Cenozoic in China. The terrestrial depositional processes with unique geological conditions has largely influenced the petrophysical properties of reservoirs, and has resulted in low maturity of debris component and rock texture, high heterogeneity of reservoir rocks and high variation in the continuity of sand bodies. The reservoir is usually lamina sandstone interbbeded with mudstone. The depth to the reservoirs and diagenesis are the factors that control physical properties of the reservoir. The hydrocarbon has short migration path because the reservoir rock is located near the source rock. The migration direction of hydrocarbon, either laterally or vertically, depends mainly on the types of sandbodies. Rich hydrocarbon accumulation area is usually associated with structure\|lithology trap, fault trap and lentoid sand trap. Eight pool\|forming patterns are classified according to the types of sandbodies.