印度尼西亚北塞兰盆地构造演化及其对油气成藏条件的控制

摘要/Abstract

摘要： 在综合前人板块演化研究的基础上，结合对印度尼西亚北塞兰盆地区域地质特征的分析，将盆地构造演化分为早三叠世初始裂谷、中三叠世—中侏罗世裂谷、晚侏罗世—中中新世被动大陆边缘和晚中新世—第四纪挤压4个阶段。在此基础上探讨了不同构造演化阶段对油气成藏条件的控制作用，以期为班达弧一带的油气勘探提供借鉴和参考。分析认为，受中生代构造作用影响，裂谷期盆地经历了碳酸盐缓坡至台地的沉积演变，主力烃源岩上三叠统—中侏罗统Saman Saman组的形成受古构造格局控制，分布于裂谷期局限台地；而该期盆地南部高地上发育的Manusela组优质碳酸盐岩储层是盆地主要勘探目标。挤压期构造作用导致烃源岩热演化出现差异，并影响了各构造带圈闭类型及分布；同时再活化的断层和微裂缝改善了碳酸盐岩储层的物性，与上新统不整合面组成主要的油气运移通道。

关键词: 控制作用, 油气成藏条件, 构造演化, 北塞兰盆地, 印度尼西亚

Abstract: Based on the previous studies of plate evolution and the analysis of regional geological characteristics in the North Seram Basin, Indonesia, the basin evolution was divided into four stages, i.e. the Early Triassic initial rifting, the Middle Triassic–Middle Jurassic rifting, the Late Jurassic–Middle Miocene passive continental margin, and the Late Miocene–Quaternary thrusting. Then, the control of tectonic evolution during different stages over hydrocarbon accumulation conditions was discussed in order to provide references for the exploration in the Banda Arc area. Affected by the Mesozoic tectonic activities, the North Seram Basin experienced the sedimentary evolution from carbonate ramp to platform during the rifting stage, and major source rock in the Upper Triassic–Middle Jurassic Saman Saman Formation was developed under the control of the paleotectonic framework to distribute in the restricted platform during the rifting stage. The favorable Manusela Formation carbonate reservoirs developed during this stage on the highs in the south of the basin are the primary exploration targets. The tectonic activities during the thrusting stage led to the differences in thermal evolution of source rocks, and influenced the trap types and their distribution in tectonic belts. Moreover, the reactivated faults and micro-fractures improved the physical properties of the carbonate reservoirs, and constituted the main hydrocarbon migration pathways together with the Pliocene unconformity.

Key words: control, hydrocarbon accumulation conditions, tectonic evolution, the North Seram Basin, Indonesia

袭著纲, 胡孝林, 方勇, 尹新义, 杜宏宇. 印度尼西亚北塞兰盆地构造演化及其对油气成藏条件的控制[J]. 中国石油勘探, 2016, 21(6): 91-97.

Xi Zhugang, Hu Xiaolin, Fang Yong, Yin Xinyi, Du Hongyu. Tectonic evolution of North Seram Basin, Indonesia, and its control over hydrocarbon accumulation conditions[J]. China Petroleum Exploration, 2016, 21(6): 91-97.

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