摘要
马达班湾盆地位于安达曼海域,属于典型的弧后走滑拉张盆地,其构造演化与印度板块向缅甸微板块斜向俯冲密切相关。盆地沉积中心受实皆和墨干走滑断层控制,沉积物来源于北部的伊洛瓦底江和东北部的萨尔温江。从石油地质特征分析,研究区主要发育2套成熟烃源岩和1套生物气源岩。中中新统半深海相泥岩直接覆盖于下中新统——渐新统生物礁灰岩和浅海相砂岩之上,形成良好的储盖组合;上新统——更新统三角洲前缘砂、泥岩互层是浅层生物气的主要储盖组合。圈闭类型以断背斜、断块、生物礁圈闭及构造-岩性圈闭为主。断层和不整合面提供了有利的油气运移通道,具备较好的油气成藏条件。盆地沉积中心的断块和断垒是浅层生物气的主要勘探方向,而火山岛弧隆起带、盆地中央的继承性隆起以及东部斜坡带的构造次台阶是中深层热成因气的主要勘探方向。
Martaban Basin located in Andaman Sea, is a typical back-arc strike slip and extension basin. The tectonic evolution of Martaban Basin is closely related with the oblique convergence of the Indian beneath the Myanmar plates. Its depocenter is controlled by the Mergui and Sagaing strike-slip faults and the main sources are from the Irrawaddy River in the north and Salween River in the northeast respectively. From the analysis of characteristics of petroleum geology, the Martaban Basin comprises two mature hydrocarbon source rocks and one biological gas source rock. The Middle Miocene hemipelagic shales overlie the Oligocene-Lower Miocene reef limestones and shallow marine sandstones, which comprise good reservoir-seal assemblages. The Pliocene-Pleistocene delta front sandstones interbedded with shales are the main pays of shallow biogas. The trap types are mainly faulted-anticlines, faulted blocks, reef traps and structural-stratigraphic combined traps. Faults and unconformities are the favorable migration pathways. Future exploration should typically be oriented at faulted blocks and horst in the center area of basin for the shallow biogas, and the western volcanic uplifts, central inherited uplifts and structural terraces in eastern ramp region for the thermogenic gas respectively.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2012年第5期15-19,111-112,共5页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"大型油气田及煤层气开发"(2011ZX05028)
中国石油重大专项"全球油气资源评价"(2008E-0500)
关键词
弧后走滑拉张盆地
石油地质特征
勘探方向
马达班湾盆地
安达曼海域
back-arc strike slip and extension basin
petroleum geology feature
exploration direction
Martaban Basin
Andaman Sea
