东濮凹陷桥口深层气地球化学特征及勘探潜力

Geochemical Characteristic of Deep Gas and It’s Exploration Potential in Qiaokou Block in Dongpu Depression

杨　斌1,罗小平2,李发科3

Yang Bin , Luo Xiaoping, Li Fake

1.中原石油勘探局测井公司;2.中原油田分公司勘探开发科学研究院;3.中原油田分公司采油六厂

Well Logging Division , Zhongyuan Petroleum Exploration Bureau, SINOPEC, Henan 457001 , P. R. China

深层天然气勘探在桥口东翼取得重大突破,该地区油气呈上油下气倒置的特征,Es₂ —Es₃¹地层为油,天然气一般富集于3 600 m Es₃³以下的地层。通过天然气成分、碳同位素、A_r⁴⁰/ A_r³⁶等地化指标分析认为,其气源主要为油型气,也有部分煤型气输入。桥24 井油气注入史分析认为,该地区油气有2 期注入,第一期以油为主,第二期以气为主,第二期油气注入形成了桥口深层天然气藏。桥口东翼深层天然气的勘探前梨园洼陷一侧比葛岗集洼陷一侧更为有利。

Deep gas exploration take large success in the east side of Qiaokou block. Distribution of oil and gas in this area is oil upper and gas down , in which oil is distributed in Es2～ Es13 formation and natural gas is enriched in the Es33 ( 3 600 m) formation. Through analysis of geochemical index of gas components , carben isotope and Ar40/ Ar36 and so on , it was considered that source rock mainly is shale and part is coal. Through the oil and gas pour history of Qiao 24 well analysis , it was considered this oil and gas was poured in two periods , the first mainly poured oil and the second mainly poured gas , and second period pouring formed Qiaokou deep layer natural gas reservoir. It is concluded that the side of Qianliyuan sag is more advantageous than Gegangji sag in deep layer natural gas exploration.