CAJ | 학술논문

基于实际测试资料，统计分析奈曼凹陷奈1区块九佛堂组21口井地层水的水型、矿化度及特征系数在平面及纵向上的变化特征，并探讨研究区地层水地球化学特征与油气的保存及分布关系。结果表明：该区地层水是以阴阳离子分别为HCO3-和( Na++K+)为主的NaHCO3型水，地层水矿化度低；研究区地层水矿化度主要受控于断层的分布，靠近断层的油气井中地层水矿化度明显较远离断层的油气井中的高，主要是由于该区深部的高矿化度地层水经断层及其他运移通道运移至浅层，并与浅层地层水混合所致；地层水化学组分及离子特征系数随深度的变化表现为稳定型、正相关型和负相关型3种变化类型；纵向上，地层水的Cl-浓度、r( Cl-))/r( Mg2+)及r( Ca2+))/r( Mg2+)都随埋深的增加而增大，而HCO3-浓度及r( Na+))/r( Cl-)均随埋深的增加而减小，表明奈1区块九佛堂组地层水现今总体上处于封闭的流体动力环境，有利于油气的聚集与保存；平面上，靠近凹陷中心的奈1块油气井中地层水 r (Na+))/r(Cl-)及 r(SO42-)×100)/r(Cl-)明显较奈3块及其以西地区偏低，而 r(Cl-))/r(Mg2+)及 r(Ca2+))/r ( Mg2+)明显偏高，表明奈1块地层封闭条件好，更有利于油气藏的形成与保存；研究区断层有效沟通了烃源层与储集层，为浅层次生油气藏的形成提供了必要条件；靠近凹陷中心的奈1块是该区油气勘探的重要领域，且主干断裂和浅层分支断裂发育带是浅层次生油气藏勘探的重要区域。
기우실제측시자료，통계분석내만요함내1구괴구불당조21구정지층수적수형、광화도급특정계수재평면급종향상적변화특정，병탐토연구구지층수지구화학특정여유기적보존급분포관계。결과표명：해구지층수시이음양리자분별위HCO3-화( Na++K+)위주적NaHCO3형수，지층수광화도저；연구구지층수광화도주요수공우단층적분포，고근단층적유기정중지층수광화도명현교원리단층적유기정중적고，주요시유우해구심부적고광화도지층수경단층급기타운이통도운이지천층，병여천층지층수혼합소치；지층수화학조분급리자특정계수수심도적변화표현위은정형、정상관형화부상관형3충변화류형；종향상，지층수적Cl-농도、r( Cl-))/r( Mg2+)급r( Ca2+))/r( Mg2+)도수매심적증가이증대，이HCO3-농도급r( Na+))/r( Cl-)균수매심적증가이감소，표명내1구괴구불당조지층수현금총체상처우봉폐적류체동력배경，유리우유기적취집여보존；평면상，고근요함중심적내1괴유기정중지층수 r (Na+))/r(Cl-)급 r(SO42-)×100)/r(Cl-)명현교내3괴급기이서지구편저，이 r(Cl-))/r(Mg2+)급 r(Ca2+))/r ( Mg2+)명현편고，표명내1괴지층봉폐조건호，경유리우유기장적형성여보존；연구구단층유효구통료경원층여저집층，위천층차생유기장적형성제공료필요조건；고근요함중심적내1괴시해구유기감탐적중요영역，차주간단렬화천층분지단렬발육대시천층차생유기장감탐적중요구역。
On the basis of a large number of test data, the plane and vertical variations of formation water type, salinity and characteristic coefficient in 21 wells of Jiufotang Formation in Nai 1 block, Naiman sag were analyzed statistically. Mean-while, the relationship between geochemical characteristic of formation water and conservation of oil and gas was investigated. The results show that the formation water with lower salinity belongs to NaHCO3- type water, which is dominated by HCO3-and ( Na++K+) . The salinity of the formation water is mainly controlled by the distribution of faults in plane. And the salini-ty of the formation water near the faults is obviously higher than that of the formation water far away from the faults. This is because the formation water with higher salinity in this deep block is transported to the shallow level via faults and other chan-nels, which is mixed with the formation water in the shallow level. The chemical composition and characteristic coefficient can be divided into three types along with the variation of depth, which are stable type, positive correlation type, and nega-tive correlation type. Vertically, the concentration of Cl-, the rate of r( Cl-)/r( Mg2+) and the rate of r( Ca2+)/r( Mg2+) in-crease with depth increasing, whereas the concentration of HCO3-and the rate of r(Na+)/r(Cl-) decrease with depth in-creasing. This indicates that the formation water of Jiufotang Formation in Nai 1 block has been conserved in a relatively iso-lated dynamic environment, which is suitable for oil and gas conservation. In plane, the levels of r ( Na+)/r ( Cl-) and r ( SO4 2-)/r( Cl-) near the Nai 1 block of the sag center are lower than those of wells in Nai 3 block and the western, while the levels of r( Cl-)/r( Mg2+) , r( Ca2+)/r( Mg2+) are higher. This infers that the seal condition of Nai 1 Block is more fa-vorable to oil and gas accumulation. Source rock and reservoir can be connected by faults efficiently, which is suitable for the formation of shallow secondary reservoirs. Nai 1 block near the center of sag can be regarded as the perspective field of area. And principal faults and shallow subsidiary faults are also the interests of secondary reservoirs.