南盘江盆地构造演化与油气保存区划分
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摘要
综合分析大量实际资料、MT和地震最新成果之后认为 :南盘江盆地基底位于加里东期扬子板块被动大陆边缘两侧。海西期出现板内拉张裂陷 ,形成台盆格局 ,生物礁灰岩发育。印支期出现早期前陆盆地海相复理石沉积 ,由于早印支运动使T2 砂泥岩揉褶成山 ,晚期前陆盆地夭折。经印支—燕山褶断运动和喜山期的改造后 ,最终出现田林T2 砂泥岩覆盖区 ,即田林油气保存区 ,成为油气勘探的主要地区。该区具有受力相对较弱 ,中深层海西构造层背斜大而完整 ,且有P2 —P1m丘台礁灰岩发育 ,D1-2 gf丘台礁灰岩从MT资料也发现多处 ,主要勘探目标明确。但该区在按部颁标准进行构造单元划分、区带评价、优选圈闭和钻探井位时 ,明显地感到对本区不合适。因而提出用油气保存区、保存分区和保存单元三级划分取代原构造单元三级划分 ,并提出划分依据、评价原则和初步划分表 ,阐述保存区可供勘探的主要目标和特点 ,在盆地整体评价较差的情况下也能够优选出保存单元进行勘探。
After having comprehensively analyzed a great deal of practical data and the newest MT and seismic achievements,it is considered that the basement of Nanpanjiang Basin was located in the both sides of the passive continental margin of Caledonian Yangzi Plate;an introplate tension taphrogenic depression occurred in Hercynian,forming a platformal basin framework with grown biohermal limestomes;the marine flysch deposition of early foreland basin appeared in Indosinian;owing to early Indosinian movement the sand mudstones(T 2)were folded into mountains,which made the late foreland basin be withered away;and reformed by Indosinian Yanshanian orogeny and Himalayan orogeny,the Tianlin sand mudstone(T 2) covering region,i.e.the Tianlin hydrocarbon preservation region,appeared at last,becoming the major area of oil and gas exploration.This region is of the properties as being relatively weaker forced,large and full medium deep Hercynian structural layer anticlines and grown mound table reef limestones(P 2～P 1 m ),etc.In the region,the principal exploration target is clear,because the mound table reef limestones(D 1 2 gf ) were found at several places by MT data.However,it is unsuitable to carry out structural element division,regional evaluation and the optimization of trap and well location according to the ministerial standard.So a new 3 class division,i.e.hydrocarbon preservation region,preservation subregion and preservation unit is proposed to take the place of the former 3 class structural element division and the division bases,evaluation principle and primary dividing table are put forward.On the basis of this,the major exploration targets in the preservation region and their properties are analyzed,so some preservation units can be also optimized for exploration under the circumstances of a lower basin evaluation as a whole.
After having comprehensively analyzed a great deal of practical data and the newest MT and seismic achievements,it is considered that the basement of Nanpanjiang Basin was located in the both sides of the passive continental margin of Caledonian Yangzi Plate;an introplate tension taphrogenic depression occurred in Hercynian,forming a platformal basin framework with grown biohermal limestomes;the marine flysch deposition of early foreland basin appeared in Indosinian;owing to early Indosinian movement the sand mudstones(T 2)were folded into mountains,which made the late foreland basin be withered away;and reformed by Indosinian Yanshanian orogeny and Himalayan orogeny,the Tianlin sand mudstone(T 2) covering region,i.e.the Tianlin hydrocarbon preservation region,appeared at last,becoming the major area of oil and gas exploration.This region is of the properties as being relatively weaker forced,large and full medium deep Hercynian structural layer anticlines and grown mound table reef limestones(P 2～P 1 m ),etc.In the region,the principal exploration target is clear,because the mound table reef limestones(D 1 2 gf ) were found at several places by MT data.However,it is unsuitable to carry out structural element division,regional evaluation and the optimization of trap and well location according to the ministerial standard.So a new 3 class division,i.e.hydrocarbon preservation region,preservation subregion and preservation unit is proposed to take the place of the former 3 class structural element division and the division bases,evaluation principle and primary dividing table are put forward.On the basis of this,the major exploration targets in the preservation region and their properties are analyzed,so some preservation units can be also optimized for exploration under the circumstances of a lower basin evaluation as a whole.
引文
刘特民 ,“雪峰隆起西缘的冲断推覆构造及其找油意义” ,《天然气勘探与开发》 ,1991年
1 刘宝王君等 中国南方岩相古地理图集 北京 :科学出版社 ,1994
2 杨惠民、刘炳温等 滇黔桂海相碳酸盐岩地区最佳油气保存单元的评价与选择 贵阳 :贵州科学出版社 ,1999
3 刘特民等 滇黔桂上扬子地区构造沉积演化特征 北京 :石油工业出版社 ,1993
1 刘宝王君等 中国南方岩相古地理图集 北京 :科学出版社 ,1994
2 杨惠民、刘炳温等 滇黔桂海相碳酸盐岩地区最佳油气保存单元的评价与选择 贵阳 :贵州科学出版社 ,1999
3 刘特民等 滇黔桂上扬子地区构造沉积演化特征 北京 :石油工业出版社 ,1993
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