PDF《四川盆地须家河组须一、三和五段天然气 源内成藏潜力与有利...》

石油勘探与开发2011 年8月PETROLEUM EXPLORATION AND DEVELOPMENT Vol.

38 No.4

385 文章编号:1000-0747(2011)04-0385-09 四川盆地须家河组须

一、三和五段天然气 源内成藏潜力与有利区评价 赵文智

1 ,卞从胜

2 ,徐春春

3 ,王红军

2 ,王铜山

2 ,施振生

2 (1. 中国石油勘探与生产公司;

2. 中国石油勘探开发研究院;

3. 中国石油西南油气田公司) 基金项目:国家重点基础研究发展计划(973)项目(2007CB209504) 摘要:目前四川盆地须家河组天然气藏勘探和发现主要集中于须

二、

四、六段,气藏总体表现出充满度不高、低部 位含水饱和度偏高、储量动用比例偏低、储集层含气范围有限的特点,须

一、

三、五段则被作为烃源岩.在对须

一、

三、五段进行成藏条件研究和已知出气点解剖分析的基础上,提出川西北、川西南和川中部分地区须

一、

三、五段 发育规模较大的砂体,各段有利含气面积约

5 000~11

000 km2 ,储集层连续性较好,单层延伸长度达 15~20 km, 具备源内成藏的有利条件,可形成岩性或构造-岩性圈闭气藏,比须

二、

四、六段的成藏潜力和丰度更好,经勘探可 形成工业规模的天然气储量,今后应该加强上述地区须

一、

三、五段源内天然气成藏研究与勘探力度,尤其是须三 和须五段.图8表4参19 关键词:源内成藏;

有利地区;

须家河组;

四川盆地 中图分类号:TE122.1 文献标识码:A Assessment on gas accumulation potential and favorable plays within the Xu-1,

3 and

5 Members of Xujiahe Formation in Sichuan Basin Zhao Wenzhi1 , Bian Congsheng2 , Xu Chunchun3 , Wang Hongjun2 , Wang Tongshan2 , Shi Zhensheng2 (1. PetroChina Exploration &

Production Company, Beijing 100007, China;

2. PetroChina Research Institute of Petroleum Exploration &

Development, Beijing 100083, China;

3. PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China) Abstract: Natural gas exploration and discovery of the Xujiahe Formation in the Sichuan Basin are mainly concentrated in the Xu-2,

4 and

6 Members. The discovered gas reservoirs are characterized by low degree of fullness, high water saturation in lower positions, low level of produced reserves, and limited gas bearing range of reservoirs. The Xu-1,

3 and

5 Members are identified as source rocks. Based on the study of natural gas accumulation conditions and several gas-productive wells in the Xu-1,

3 and 5, this paper proposes that large scale sand bodies are developed in the Xu-1,

3 and

5 Members in the northwest, southwest and central parts of the Sichuan Basin. In each member, the favorable gas bearing area is about

5 000-11

000 km2 , reservoir rocks have good continuity with single layer extension up to 15-20 km. It is believed that these sand bodies have favorable conditions for gas accumulation within source kitchens to form lithologic or structural-lithologic gas reservoirs, and have better accumulation potential and higher gas-bearing abundance than that of the Xu-2,

4 and

6 Members. The exploration practice revealed that economic gas reserves may be generated. It is suggested that more efforts be made to study the gas accumulation conditions in the Xu-1,

3 and

5 Members (especially the Xu-3 and Xu-5 Members) and more exploration work be fulfilled in these strata. Key words: accumulation inside source;

favorable play;

Xujiahe Formation;

Sichuan Basin