Ordovician Fracture-Cavity Filling Sequence and Its Logging Responses in Tahe Oilfield

doi:10.7657/XJPG20210106

Abstract

Abstract:

Fracture-cavity filling in carbonate rocks has an important influence on fracture-cavity reservoirs. Accurately identifying the types of fracture-cavity fillings and establishing filling patterns are conducive to better identifying and evaluating the development situations of fracture-cavity reservoirs. By observing the core, the fracture-cavity fillings can be divided into sand-shale fillings, breccia fillings, chemical fillings and empty filling. The logging response characteristics of various fillings are calibrated by using logging information. Based on the main controlling factors of karst forming, the fracture-cavity fillings can be divided into three types, namely underground river type, fault-controlled karst type, and surface karst type, and then establish filling mode. On this basis, combined with core observations, the general filling sequence of different filling modes and its logging responses are summarized. It is found that large karst caves are easier to be drilled in the fillings of the underground river type, the fillings of fault-controlled karst type is conducive to migration of oil and gas, and dissolved cavities are developed in the fillings of surface karst type.

Key words: Tahe oilfield, Ordovician, carbonate rock, fracture-cavity reservoir, fracture-cavity filling, filling pattern, filling sequence, logging response

CLC Number:

TE122.221

LIU Jingjing, MAO Cui, WEI Hehua, QUAN Lianshun, LIU Zexuan. Ordovician Fracture-Cavity Filling Sequence and Its Logging Responses in Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2021, 42(1): 46-52.

Figures/Tables 5

Fig. 1.

Table 1

Fig. 2.

Fig. 3.

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井名	鹰山组顶深/m	表层岩溶带/m	垂向岩溶带/m	径流岩溶带/m	缝洞段/m	岩心特征	充填序列类型
S64井	5 470.5	5 470.5—5 515.5	5 515.5—5 555.5	5 515.5—5 625.5	5 484.0—5 490.0	灰色泥岩夹薄层角砾岩,裂隙含油	表层岩溶型
S64井	5 470.5	5 470.5—5 515.5	5 515.5—5 555.5	5 515.5—5 625.5	5 490.0—5 506.0	多角砾充填,见高角度裂缝,有擦痕	断控岩溶型
S75井	5 501.5	5 501.5—5 546.5	5 546.5—5 586.5	5 586.5—5 656.5	5 526.0—5 534.0	多种类型充填物混合充填	地下暗河型
S75井	5 501.5	5 501.5—5 546.5	5 546.5—5 586.5	5 586.5—5 656.5	5 681.0—5 689.0	巨晶方解石充填缝洞	地下暗河型
T403井	5 405.0	5 405.0—5 450.0	5 450.0—5 490.0	5 490.0—5 560.0	5 536.0—5 542.0	多种类型充填物混合充填,少化学充填物,多搬运角砾	地下暗河型
T615井	5 521.0	5 521.0—5 566.0	5 566.0—5 606.0	5 606.0—5 676.0	5 517.0—5 526.0	裂缝含油,多垮塌充填,方解石、砂泥质充填裂缝或角砾间	表层岩溶型
T615井	5 521.0	5 521.0—5 566.0	5 566.0—5 606.0	5 606.0—5 676.0	5 533.0—5 560.0	多种类型充填物混合充填,多砂岩充填,常见泥质条带,裂缝、缝合线发育	地下暗河型