松辽盆地北部徐深1区块气藏特征与经济评价
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摘要
本文运用层序地层学、现代地球物理学、沉积学、构造学及经济学等理论进行多学科联合攻关,以松辽盆地北部徐深1区块为研究对象,从基础地质研究出发,针对断陷盆地火山岩和砾岩储层的特殊地质条件,依据新资料,对徐深1区块进行重新储量计算和经济评价。
     徐深1区块主要发育营一段火山岩和营四段砾岩两套储层。火山岩相与火山岩的物性密切相关,火山岩有利储层为爆发相和喷溢相上部亚相。砾岩储层物性受原始沉积条件与后期成岩作用影响,沉积相控制了砾岩储层原生粒间孔隙的发育,杂基含量较少的辫状三角洲相是最有利的相类型,砾石之间的支撑降低了基质的压实程度,使孔隙得以保存。
     营一段火山岩气藏流体分布具有明显的上气、下水的特点。各井没有统一的气水界面,构造高部位气柱高度大,气水界面高,低部位气柱高度小,气水界面也低。含气高度超出构造圈闭,岩性圈闭是火山岩气藏成藏的主控因素,综合分析认为,营一段火山岩气藏类型为构造岩性气藏。营城组四段砾岩储层位于营城组一段火山岩气藏之上,具有聚集天然气成藏的有利条件。储层大面积连片,天然气分布受储层物性控制。从气柱高度和压力特征来看,本区营四段砾岩气层分布已经超出构造圈闭范围,具有岩性气藏的特点,综合分析认为,营四段砾岩气藏为岩性气藏。
     气田储量技术经济评价指标较好,经济可采储量等于技术可采储量为206.69×10.8m~3,扣除已采出量0.6396×10~8m~3,剩余可采储量为206.05×10~8m~3。从盈亏平衡分析和敏感性分析看,徐深1区块的开发抗风险能力较强,具有可行性。
     徐家围子断陷资源潜力大,本文所述及的经济评价方法对断陷内其它储量的经济评价具有很好的借鉴意义,此方法评价结果可信度高,对指导进一步的勘探工作具有重要意义。
This article utilized several theories such as sequence stratigraphy, modern geophysics, sedimentology, tectonics and economic, carried on multi-disciplinary union attack, took north of Songliao Basin Xushen1 sub-area as the research object, embarked from the foundation geology research, aimed fault basin volcanic rock and conglomerate reservoir special geological condition, rested on the new material, again carried on calculation of reserves and economic evaluation to Xushen1 sub-area.
     Xushen1 sub-area main growed two sets of reservoirs such as Ying1 section volcanic rock and Ying4 section conglomerates. The volcanic lithofacies dealed volcanic rock physical property with close correlation, volcanic rock was advantageous reservoir and gushed out for the eruption upside subfacies. The conglomerate reservoir physical property deposited condition and the later period diagenesis influence, the sedimentary facies had controlled conglomerate reservoir primary intergranular hole growth, the mixed base content less pigtailed shape delta was most advantageous resembling, between broken stone strut reduced matrix compaction degree, enabled the hole to preserve.
     Ying1 volcanic rock gas pools fluid distributed obvious characteristic with gas top and water bottom. Various wells unificated gas water contact surface, structure high spot air column big, gas&water contact surface high, low spot air column small, gas&water contact surface was also low. Containing gas highly surpassed deformational trap, lothological trap was the main controlling factor of volcanic rock gas pool creating, generally analysis believed, Ying1 volcanic rock gas pool type was structure lothological gas pool.
     Yingcheng4 section conglomerate pools was located above Ying1 section volcanic rock gas pools, gathered natural gas created advantageous conditions. Reservoirs were big area continually piece, natural gas distribution was controlled by reservoir physical property. From air column altutide and pressure characteristic, Ying4 section conglomerate aerospheres distribution already surpassed the deformational trap scope, had the lothological gas pool characteristic, generalized analysis, Ying4 section conglomerates gas pool was lothological gas pool.
     The natural gas field reserves technology economic evaluation target is better, the economical recoverable resources are equal to the technical recoverable resources with 206.69×10~8m~3, deducts has picked output 0.6396×10~8m~3, the surplus recoverable resources are 206.05×10~8m~3. Looked from loss&balance analysis and the sensitive analysis, Xushen1 sub-area development anti- risk ability is stronger, has the feasibility.
     Xujiaweizi depression resource potential is big, this article mentions the economic evaluation method , other reserves economic evaluations have very good model significance, this method appraisal result confidence level is high, instructs the further prospecting work to have the vital significance.
引文
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