问题 问答题 简答题

试述前陆盆地的石油地质特征。

答案

参考答案:

1)源岩条件特征:具被动大陆边缘沉积型和前陆坳陷型烃源岩系,岩石类型主要为海相碳酸岩、页岩。

其成熟的生油气中心总是靠近深坳带一侧,受造山期间的挤压以及地层负荷的作用,深坳陷部位的油气沿断层、不整合面或渗透储集层向上或向克拉通一侧进行运移。

2)储层特征:也可分为两大体系,下部以台地相碳酸盐岩为主体的储集体系和上部以陆相碎屑岩为主体的储集体。

3)圈闭特征:背斜构造圈闭、断层圈闭和地层圈闭是此类盆地最普遍和最为重要的圈闭。

背斜构造圈闭主要为一些逆冲断层相关褶皱,分布在靠近盆地逆冲断裂带一侧。

断层圈闭既有裂陷阶段形成的由正断层构成的断块圈闭,亦有后期造山阶段运动影响,在逆掩冲断作用下形成的逆冲断层构成的断层圈闭,以及早期正断层反转形成的断块或前缘隆起轴部张扭性断裂形成的圈闭等。

地层圈闭主要发育在靠近克拉通一侧。

因多期升降会形成多个不整合面,其地层总是向克拉通方向逐渐超覆,因此不整合类地层圈闭也是前陆盆地常见的一种重要圈闭

阅读理解

A beautiful woman took a plane on business. She found her seat and sat down next to a young man. The man was just thinking of making a few dollars on the plane. When he saw the woman, he got an idea.

“Hey! Would you like to play a game?” he asked the woman. “No, thank you. I just want to take a nap (打盹),” the woman answered. “It’s really easy. All you have to do is to answer the questions that I ask you. If you don’t know the answer, you give me five dollars. If I don’t know the answer to your question, then I’ll give you five dollars.” “No,” the woman still refused. “OK. If I don’t know the answer to your question, I’ll give you five hundred dollars. How about that?” the man said. Then the woman became interested and decided to join in the game.

“OK. How many moons does Jupiter (木星) have?” asked the young man. The woman reached into her purse and took out a five-dollar bill. “What goes up the mountain with three legs and comes back with four?” the woman asked. Then the young man took out his computer and searched the Internet for an answer. Minutes later, the young man handed five hundred dollars to the woman.

After a few hours, the young man really wanted to know the answer to the question. So he asked the woman, “What is the answer to your question?” The woman reached into her purse and handed the young man a five-dollar bill.

小题1:Why did the man ask the woman to play a game?

A.He wanted to show his kindness.

B.He wanted to have a pleasant journey.

C.He wanted to earn some money from it.

D.He wanted to make friends with the woman.小题2:How much did the woman get at the end of the story?

A.$ 500.

B.$ 5.

C.$ 10.

D.$ 490.小题3:What can we learn from the last paragraph?

A.The woman told the man the answer to her question.

B.The woman gave the man’s money back to him.

C.The woman asked the man another question.

D.The woman didn’t know the answer, either.小题4:We can learn from the story that the woman is ______.

A.clever

B.friendly

C.polite

D.honest

多项选择题