摘要
我国西部叠合盆地油气资源丰富,随着勘探难度逐年增加,如何准确定位有利成藏区带对增加勘探成功率至关重要。通过对比叠合盆地主要大中型油气田发现,叠合盆地大都为多期成藏,且晚期成藏有利于油气规模化保存。在大量总结叠合盆地多个油气成藏过程、特点和模式的基础上,结合研究区带的构造演化特点,按照叠合盆地构造变动模式划分,将西部叠合盆地油气多期成藏模式划分为5种,分别是油气连续充注型、早期强烈改造型、中期强烈改造型、晚期强烈改造型和多期充注改造交替型。在晚期成藏有利于油气勘探的前提下,分析认为具有油气连续充注型油气成藏的区域和周边地区由于构造变动轻微,破坏幅度最小,因此油气藏类型较多,规模化可能性最大,最具油气勘探有效性,而多期充注改造交替型成藏模式在构造变动频繁剧烈的影响下,使得油气藏破坏量较大,保存下来的可能性很小,因此也最不具备勘探有效性,此类地区应该尽可能规避。
By comparing the large and medium-sized oil and gas fields,it is discovered that reservoirs in superimposed basins are most of multi-stage formation process,and the late accumulation is favorable for large-scale preservation.Based on summary of accumulation progress,characteristic and model of the vorious oil-gas pool,combined with features of the tectonic evolution of the study area,it composes the hydrocarbon accumulation pattern classification,and divides oil and gas multi-phase accumulation model into 5 types according to the criteria： continuous oil-gas filled,early strong reformation,strongly reworked in medium-term,late strongly reworked and alternation of multi-stage filling and reworked.Strength of structural changes and occurring period are taken into account to construct the pattern classification criteria,and the two parameters are all relative.The characteristic of continuous oil-gas filled is that the oil and gas transportation capability is strong and it can not only form the normal reservoir,but also the pyrolysis gas reservoir.The early strong reformation means the strength of structure is more stronger and the range is larger during the early period,it makes the hydrocarbon expelled from resource can not be assemble in the suitable trap,in contrast the later oil and gas can form the reservoir.Strongly reworked in medium-term mode indicates that much of tectonic movements strongly happened after the reservoir accumulated,oil and gas reservoirs will be reformed or lost to some extent each time,so the late contribution is the main result of this type.The late strongly reworked type means that the hydrocarbon formed and expelled from source all accumulated in the relatively stable environment,and in the late,there happens the strong and large-scale tectonic movements,these movements change the existed reservoirs in the aspect of quality and quantity.The last one is multi-stage filling and reworked type,which most occurs in the region happened strong and frequent extremely tectonic movements.Althou
出处
《沉积学报》
CAS
CSCD
北大核心
2012年第1期166-178,共13页
Acta Sedimentologica Sinica
基金
国家重点基础研究发展规划(973)项目(中国西部典型叠合盆地油气成藏机制与分布规律)(2006CB202300)研究部分成果
关键词
叠合盆地
多期成藏模式
勘探有效性
晚期成藏
构造变动
superimposed basin
model of multi-stage accumulation
exploration effectiveness
late accumulation
tectonic movement
