吉林探区深层天然气勘探前景

Exploration Prospect of Deep Gas in Jilin Oilfield

松辽盆地南部深层落实断陷19个,面积3.0586×104km2,断陷类型以单断型、双断型及复合型为主.深层发育侏罗系和白垩系两套地层,深层烃源岩主要分布在营城组及沙河子组,有机质类型为Ⅱ～Ⅲ型,以Ⅱ2型为主,发育四种类型储层(砂岩、砂砾岩、火山岩及变质岩),储层物性较差,发育三种生储盖组合.基底-泉二段均有油气分布,纵向上划分三套含油气系统,平面上发育5个油气聚集带(区),第三次资源评价深层石油资源量3.995×108m3,天然气资源量8300×108m3.'九五'至'十五'初深层勘探取得重要进展,发现了一批油气田(藏),累计提交石油地质储量1321×104t,天然气地质储量183.78×108m3.'十五'后三年计划实现天然气(100～200)×108m3储量目标,'十一五'期间规划天然气(300～500)×108m3储量目标.

There are 19 proven rifts in deep formations in the south of Songliao Basin, with an area of 3.0586 × 104km2. These rifts are mainly single-faulted, double-faulted and their composite style. There developed Jurassic and Cretaceous in deep formations. The deep hydrocarbon source rocks are mainly distributed in Yingcheng and Shahezi Fm, and their organic matter types are Ⅱ-Ⅲ, mainly Ⅱ2. Four kinds of reservoirs, i.e. sandstone, glutenite, volcanics and metamorphite, are developed. The physical properties of these reservoirs are poor. Three kinds of source-reservoir-sealing combinations are developed. The hydrocarbon is distributed from the basement to the second section of Quantou Fm. Three sets of Petroleum systems are developed vertically, and five hydrocarbon accumulation zones laterally. It is estimated that the oil and gas resource are 3.995 × 108m3 and 8300 × 108m3 respectively based on the third-round resources evaluation. Important exploration progresses have been made during the years from 'the ninth five-year plan' to the first stage of 'the tenth five-year plan', and some hydrocarbon reservoirs were found. The cumulative proven reserves of oil and gas were 1321 × 104t and 183.78 × 108m3 respectively. It is estimated that the gas reserves will be (100-200) × 108m3 during the last three years of 'the tenth five-year plan', and (300-500) × 108m3 during 'the eleventh five-year plan'.