松辽盆地中央古隆起带(北部)天然气成藏条件分析及勘探前景

doi:10.3969/j.issn.1672-7703.2017.05.001

摘要/Abstract

摘要： 松辽盆地中央古隆起带（北部）具备良好的天然气藏形成条件，是该盆地天然气风险勘探的重要领域之一，该领域几十年久攻不克，成藏条件及勘探前景认识不清。综合岩心、录井、测井及三维地震、重力、磁法等资料，在大量统计分析和地质研究的基础上，探讨了中央古隆起带（北部）的天然气成藏条件及勘探方向，提出了4点新认识：①中央古隆起带为一个在冲断褶皱基底上形成的具有潜山性质的隆起带；②中央古隆起带（北部）东侧徐家围子断陷沙河子组烃源岩有机质丰度高、生气强度大，侧向供气能力强；③中央古隆起带（北部）发育花岗岩、变质岩、砾岩及砂岩4种储层类型；④中央古隆起带（北部）发育3种类型圈闭、2套输导体系和3种类型气藏。进而明确了基岩潜山气藏、冲沟岩性气藏的勘探方向，评价优选了I类勘探区10个、II类勘探区6个，为松辽盆地中央古隆起带（北部）深层天然气风险勘探部署提供了科学依据。

关键词: 披覆, 冲沟, 基岩潜山, 天然气成藏条件, 中央古隆起带(北部), 松辽盆地

Abstract: The central paleo-uplift belt (north) of the Songliao Basin, as one major region of risk exploration of natural gas, has favorable conditions for natural gas accumulation. However, no breakthrough has been made in this region for decades, and the hydrocarbon accumulation conditions and exploration perspective have not been thoroughly studied. This paper analyzes natural gas accumulation conditions and exploration targets in the central paleo-uplift belt (north) using core, mud logging, well logging, 3D seismic, gravity and magnetic data as well as a great deal of statistics, analysis and geology studies, and proposes new four cognitions:(1) the central paleo-uplift belt has features of buried hill and was formed on the thrust folded base; (2) the source rock has a high organic matter abundance, huge gas generating potentials and strong lateral gas supplies in the Shahezi Formation of the Xujiaweizi rift in the east of the central paleo-uplift belt (north); (3) the central paleo-uplift belt (north)contains four types of reservoirs:granite, metamorphite, conglomerate and sandstone; (4) the central paleo-uplift belt (north)contains three types of traps, two sets of conductive systems and three types of gas pools. Based on the results, the exploration targets of the basement buried hill gas pools and the gully lithologic gas pools have been selected, 10 class I and 6 class Ⅱ exploration regions have been evaluated and optimized. This provides the scientific base for risk exploration of deep gas reservoirs in the central paleo-uplift belt (north), the Songliao Basin.

Key words: drape, gully, basement buried hill, natural gas accumulation condition, central paleo-uplift belt (north), Songliao Basin

中图分类号:

TE122.1

杜金虎. 松辽盆地中央古隆起带(北部)天然气成藏条件分析及勘探前景[J]. 中国石油勘探, 2017, 22(5): 1-14.

Du Jinhu. Analysis of natural gas accumulation conditions and exploration perspective in the central paleo-uplift belt (north), Songliao Basin[J]. China Petroleum Exploration, 2017, 22(5): 1-14.

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