松遼盆地梨樹斷陷油氣富集規律

摘 要:梨樹斷陷位于松遼盆地斷陷群的東南部，是松遼盆地含油氣豐富的斷陷之一。目前在該區已發現9個油氣田。為了進一步提高勘探程度，尋找有利油氣儲集帶，本文通過對已發現油氣藏特征及分布規律進行分析，得出來了三個油氣富集規律:一南北兩斜坡巖性油氣藏發育；二晚期構造改造輕微區，原生油氣藏保存條件有利；三油氣呈環帶狀分布。油氣富集規律的分析為進一步在梨樹斷陷尋找規模儲量及實現油藏連片起到積極的指導作用。

關鍵詞:松遼盆地 梨樹斷陷 油氣藏 富集規律

中圖分類號:P577 文獻標識碼:A 文章編號:1674-098X(2011)03(c)-0044-02

Abstract:Lishu fault depression locates the southeastern of the Songliao basin，which is one of the hydrocarbon-rich fault depressions. At present the nine oil and gas fields have been discovered in the area.To further enhance the degree of exploration，looking for the favorable oil and gas reservoir zone，By analyzing the characteristics and distribution of oil and gas reservoirs，the article summarized the three hydrocarbon accumulation:First，the South and North Slope s developed lithologic hydrocarbon reservoir;Two， the primary reservoir storage conditions are favorable in late period structure slight area;Three，distribution of oil and gas is zonal. Analysis of oil and gas accumulation has played an active guiding role for further finding the size of reservoir storage and joining the hydrocarbon reservoirs in the Lishu fault depression.

Keywords: Songliao BasinLishu fault depressionHydrocarbon reservoirAccumulation

梨樹斷陷位于松遼盆地斷陷群東帶南端，是斷坳疊置型復合盆地，下部為西斷東超的單斷箕狀盆地，地層由西向東及南部斜坡區逐層超覆，向北部斜坡急劇收敘，減薄，靠近楊大域子凸起部位從上到下逐層被剝蝕。梨樹斷陷劃分了四個二級構造帶:北部斜坡區、西部陡坡區、中央構造帶、東部斜坡區。(如圖1)本文在構造分區的基礎上，通過對沉積相、烴源巖匹配、物性、及新鉆井情況分析，結合已發現油氣藏特征及分布規律總結出以下三點富集規律。

1 南北兩斜坡巖性油氣藏發育

通過對近期鉆探效果以及區帶評價優選研究，梨樹斷陷北部斜坡帶和東南斜坡帶具備大中型油氣田成藏條件，地層、巖性圈閉發育，具有良好的勘探潛力，是最有利的增儲潛力區帶，中央構造帶深層天然氣以及雙龍次凹值得繼續探索。……