收稿日期: 2012-05-28
修回日期: 2012-07-17
网络出版日期: 2012-12-10
基金资助
国家重大专项项目“23”课题1“中国近海富生烃凹陷再评价与新领域勘探方向研究成果”(编号:2011ZX05023-001-07)资助.
Reservoir-forming Characteristic and Model of the Palaeogene Condensate Gas Reservoir with Low Permeability in Wenchang A Sag
Received date: 2012-05-28
Revised date: 2012-07-17
Online published: 2012-12-10
低渗凝析气藏的成藏机理是影响文昌A凹陷天然气勘探开发成效的关键问题。运用烃源岩地球化学、储层沉积学和成藏综合分析等方法，对天然气地质条件、气藏特征及成藏动态过程进行系统研究。得出如下新认识:①研究区下渐新统恩平组一段厚层湖沼相、滨浅湖相泥岩是主要的优质气源岩，该套烃源岩分别与恩平组二段、珠海组发育的(扇)三角洲相、潮坪相储层形成 “自生自储” 和“下生上储”2套成藏组合；②恩平组、珠海组储层埋深大于3 500m,孔隙度小于12％，渗透率小于1×10-3μm，沉积微相和成岩作用控制了“甜点”储层的分布；③恩平组、珠海组储层“先致密、后成藏”致使油气的运移距离较短，具备“近源运移、晚期成藏”的特征。根据上述新认识提出2种成藏模式，即陡坡带垂向运聚模式和缓坡带垂向＋侧向运聚模式，并指出北部缓坡带是下一步新领域拓展勘探的重要方向。
甘军，张迎朝，邓志勇,杨金海,邓广君,郑榕芬,李才 . 文昌A凹陷古近系低渗凝析气藏成藏特征与成藏模式[J]. 天然气地球科学, 2012 , 23(6) : 1060 -1069 . DOI: 10.11764/j.issn.1672-1926.2012.06.1060
Reservoir-formation mechanism of the Palaeogene condensate gas reservoir with low permeability in Wenchang A sag is a key issue which affects the exploration and development of natural gases.Based on the application of source geochemistry,reservoir sedimentology and reservoir comprehensive analysis,a systematic study has been carried out on the geological condition of reservoir-formation,reservoir-formation feature and dynamic reservoir-formation process.Following three conclusions have been achieved:(1)Wenchang lacustrine mud and Enping swamp carbonaceous mud form two-layer high quality source rocks;(2)Oligocene fluvial and delta sediments of Enping and Zhuhai Formations are major reservoirs,which have the characteristics of great burial depth (＞3 500m),POR＜12％，PERM＜1×10-3μ m2.Distribution of “sweet spot” is controlled by sedimentary micro-facies and diagenesis;(3)The early compaction and late accumulation of the Enping and Zhuhai reservoirs resulted in the short migration distance of oil-gas,hence it demonstrates the characteristics of short migration and late accumulation.According to these new cognitions,we bring forward two reservoir-forming patterns: vertical migration at the steep slope and the vertical and lateral migration at the gentle slope.It is indicated that the north gentle slope is a favorable exploration trend.
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