石油与天然气地质
石油與天然氣地質
석유여천연기지질
OIL & GAS GEOLOGY
2014年
5期
654-660
,共7页
控气因素%沉积微相%储层特征%须家河组%元坝地区%四川盆地
控氣因素%沉積微相%儲層特徵%鬚傢河組%元壩地區%四川盆地
공기인소%침적미상%저층특정%수가하조%원패지구%사천분지
control factor of gas accumulation%sedimentary microfacies%reservoir characteristics%Xujiahe Formation%Yuanba area%Sichuan Basin
川东北元坝地区须家河组三段已获千亿方预测储量，具有良好的勘探开发潜力，但其储层特征及控气因素不明确。利用岩心、薄片、物性等分析测试资料，采用井震结合的方法，对该区须三气藏及主要目的砂组的储层特征及控气因素进行了研究。研究认为，须三段以辫状河三角洲平原-三角洲前缘亚相沉积为主，钙屑砂岩具有碳酸盐岩岩屑含量高、石英含量低的特点，测井上显示低伽马、高电阻的特征。（含砾）钙屑砂岩储层总体上为特低孔-特低渗储层，储集空间类型多样，以溶蚀孔及其中的自生矿物晶间孔为主，（微）裂缝为辅；溶蚀孔隙主要分布于钙屑颗粒粒间，连通性好，是优质储层的最重要的储集空间。三角洲平原-前缘亚相的高能分流河道含砾钙屑砂岩、钙屑砂岩、砂砾岩有利岩相是天然气富集和高产的先决条件。沿层间发育的平缝和低角度缝及沿裂缝发育的溶蚀孔隙是天然气富集和高产的决定性因素，构造和断裂是天然气的富集和高产的重要条件。
川東北元壩地區鬚傢河組三段已穫韆億方預測儲量，具有良好的勘探開髮潛力，但其儲層特徵及控氣因素不明確。利用巖心、薄片、物性等分析測試資料，採用井震結閤的方法，對該區鬚三氣藏及主要目的砂組的儲層特徵及控氣因素進行瞭研究。研究認為，鬚三段以辮狀河三角洲平原-三角洲前緣亞相沉積為主，鈣屑砂巖具有碳痠鹽巖巖屑含量高、石英含量低的特點，測井上顯示低伽馬、高電阻的特徵。（含礫）鈣屑砂巖儲層總體上為特低孔-特低滲儲層，儲集空間類型多樣，以溶蝕孔及其中的自生礦物晶間孔為主，（微）裂縫為輔；溶蝕孔隙主要分佈于鈣屑顆粒粒間，連通性好，是優質儲層的最重要的儲集空間。三角洲平原-前緣亞相的高能分流河道含礫鈣屑砂巖、鈣屑砂巖、砂礫巖有利巖相是天然氣富集和高產的先決條件。沿層間髮育的平縫和低角度縫及沿裂縫髮育的溶蝕孔隙是天然氣富集和高產的決定性因素，構造和斷裂是天然氣的富集和高產的重要條件。
천동북원패지구수가하조삼단이획천억방예측저량，구유량호적감탐개발잠력，단기저층특정급공기인소불명학。이용암심、박편、물성등분석측시자료，채용정진결합적방법，대해구수삼기장급주요목적사조적저층특정급공기인소진행료연구。연구인위，수삼단이변상하삼각주평원-삼각주전연아상침적위주，개설사암구유탄산염암암설함량고、석영함량저적특점，측정상현시저가마、고전조적특정。（함력）개설사암저층총체상위특저공-특저삼저층，저집공간류형다양，이용식공급기중적자생광물정간공위주，（미）렬봉위보；용식공극주요분포우개설과립립간，련통성호，시우질저층적최중요적저집공간。삼각주평원-전연아상적고능분류하도함력개설사암、개설사암、사력암유리암상시천연기부집화고산적선결조건。연층간발육적평봉화저각도봉급연렬봉발육적용식공극시천연기부집화고산적결정성인소，구조화단렬시천연기적부집화고산적중요조건。
The 3rd Member of Xujiahe Formation(T3x3)has great petroleum exploration potential and its predicted gas re-source volume is a hundred billion cubic meters in Yuanba area , Northeast Sichuan Basin .However , the characteristics and gas accumulation control factors are not clear .Based on cores ,thin sections and physical properties ,the characteris-tics and gas accumulation control factors of T 3 x3 were studied through correlation between well and seismic data .The re-sults indicate that the dominant sedimentary facies are braided river delta plain and delta front .The calcarenaceous sand-stones are characterized by high carbonate debris content and low quartz content ,and low natural gamma value and high resistance .The calcarenaceous sandstones are of low porosity and extra-low permeability .The reservoirs have a variety of pore types,which are dominated by dissolution pores and authigenic mineral intercrystal pores ,followed by micro-frac-tures.The dissolution pores mainly occur in between calcarenaceous grains and have good connectivity .They are the main pore paces of high-quality reservoirs .The prior factors of gas accumulation and high production are the existence of con-glomeratic calcarenaceous sandstones ,calcarenaceous sandstones and glutenites in distributary channels of delta plain and delta front .The horizontal and low-angle interlayer fractures and the dissolution pores along the fractures are the determi-nant factors for the gas accumulation .In addition ,structures and faults are also important factors .
