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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (6): 773-785.doi: 10.11764/j.issn.1672-1926.2020.03.007

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Reservoir characteristic and gas exploration potential in Cambrian Xixiangchi Formation of Sichuan Basin

Shu-yuan SHI1(),Tong-shan WANG1,Wei LIU1,Hua JIANG1,Qiu-fen LI1,Xin LIU2,Yi-yang ZENG2,Xiang ZOU3,Li HU3   

  1. 1.Research Institution of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    2.Research Institute of Exploration and Development, Southwest Oil & Gas Field Company, PetroChina, Chengdu 610000, China
    3.Shunan Gasfield, Southwest Oil & Gas Field Company, PetroChina, Luzhou 646000, China
  • Received:2019-02-17 Revised:2020-03-18 Online:2020-06-10 Published:2020-06-17
  • Supported by:
    The China National Science & Technology Major Project(2016 ZX05004-001)

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Abstract:

The content of gypsum salt rock in Cambrian drilling in Sichuan Basin is counted. The distribution of gypsum salt rock is characterized by combining logging and seismic data. The Cambrian developed area of Sichuan Basin is divided into the undeveloped area of gypsum salt rock mainly in the ancient uplift and slope area of Leshan-Longnusi and the developing area of gypsum salt rock mainly in the area of Chuandong-Shunan. The observation and description of core and thin-section reveal that the main types of reservoir rocks are dolograinstone and dolopackstone. The reservoir space includes three categories and nine subcategories: pore type, cave type and fracture type, and the cavern type is the main type. Physical properties test show that the porosity of core is below 2% and the reservoir is above 3% in non-gypsum developed area. The core porosity is 3.5% on average and up to 5% in the development area of gypsum salt rock. Microfacies are the basis of reservoir development in the Xixiangchi Formation, and grainstone beach is the main microfacies type. The atmospheric fresh water karst is the main controlling factor for the formation of high quality reservoir in undeveloped area of gypsum salt rock. The superimposition of burial dissolution is the key to the formation of high quality reservoir in developed area of gypsum salt rock. The potential of oil and gas exploration in Xixiangchi Formation is prospected. The paleo uplift and slope area of undeveloped gypsum salt rock should be based on searching for high-quality beach reservoir influenced by the karst of atmospheric fresh water. It is an important field of exploration breakthrough to find buried dissolved and superimposed reservoir in the east-shunan area of Cambrian gypsum salt rock.

Key words: Sichuan Basin, Cambrian, Xixiangchi Formation, Grainstone beach, Paleokarst, Gypsum-salt rock

CLC Number: 

  • TE122.1

Fig.1

Gypsum-salt rock thickness distribution of Cambrian in Sichuan Basin(modified from Ref.[20])"

Table 1

Stratigraphic subdivision and comparison of the Cambrian in Sichuan Basin and its margin areas"

系统阶川西—川中小区雷波小区龙门山小区川东—渝南小区城口—巫溪小区本文

寒

武

系

上统凤山阶洗象池组二道水组娄山关群三游洞组洗象池组
长山阶
固山阶
中统张夏阶西王庙组覃家庙组
徐庄阶
毛庄阶陡坡寺组陡坡寺组高台组陡坡寺组
下统龙王庙阶龙王庙组龙王庙组清虚洞组石龙洞组龙王庙组
沧浪铺阶沧浪铺组沧浪铺组金顶山组天河板组沧浪铺组
磨刀垭组明心寺组石牌组
筇竹寺阶笻竹寺组笻竹寺组长江沟组牛蹄塘组水井沱组笻竹寺组
梅树村阶

Fig.2

Distribution of oil and gas exploration field in Cambrian Xixiangchi Formation, Sichuan Basin"

Fig. 3

Petrologic character on Cambrian Xixiangchi Formation, Sichuan Basin"

Table 2

Reservoir space type and their distribution in Cambrian Xixiangchi Formation, Sichuan Basin"

类型发育特征分布取心井及对应分布频率
孔隙原生孔晶间孔在自形晶粒白云石间可见，可为沥青充填螺观1（高）、宝龙1（中）、广探2（高）
粒间孔颗粒间孔隙，见大量沥青充填广探2（中）、合12（中）、宝龙1（中）
藻格架孔同沉积期间形成，多数孔被白云石充填，也可见沥青充填广探2（中）、安平1（低）、合12（低）
次生孔晶间溶孔在自形晶粒白云石间及靠裂缝处可见，见沥青充填螺观1（高）、广探2（高）、安平1（中）
粒间溶孔在亮晶砂屑、砂砾屑白云岩、鲕粒云岩中可见广探2（中）、安平1（中）
溶洞溶洞直径大于2 mm的溶蚀孔，有少量后期被白云石或者石英半充填广探2（高）、五科1（中）、螺观1（中）、威寒101（高）、座3（中）
裂缝构造缝多平直，具多期：早期缝平直具沥青充填螺观1（中）、威寒101（中）、五科1（中）
构造溶蚀缝沿构造缝扩溶而成五科1（中）、螺观1（中）、威寒101（中）、高科1（中）
缝合线压溶作用形成，常见大量沥青和黄铁矿宝龙1（中）、螺观1（中）

Fig.4

Reservoir space type in Cambrian Xixiangchi Formation, Sichuan Basin"

Fig. 5

Reservoir physical properties distribution in Cambrian Xixiangchi Formation, Sichuan Basin"

Fig.6

The relationship between lithology, sedimentary microfacies and physical properties of coring sections of Wells GT2 and AP1"

Fig.7

Dolostone and its fillings carbon and oxygen isoto-pes characteristic in Cambrian Xixiangchi Formation, Sichuan Basin"

Fig.8

Burial history curve（c）, inclusion homogenization temperature and salinity crossplot(a), and salinity histogram(b) in Xixiangchi Formation, Sichuan Basin"

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